char = D;code = 68 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = .;code = 46 result sql = Diagnostic change and the increased prevalence of autism.
Diagnostic change and the increased prevalence of autism.char = <;code = 60 char = b;code = 98 char = >;code = 62 char = B;code = 66 char = A;code = 65 char = C;code = 67 char = K;code = 75 char = G;code = 71 char = R;code = 82 char = O;code = 79 char = U;code = 85 char = N;code = 78 char = D;code = 68 char = ;code = 32 char = :;code = 58 char = ;code = 32 char = <;code = 60 char = /;code = 47 char = b;code = 98 char = >;code = 62 char = I;code = 73 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = h;code = 104 char = a;code = 97 char = v;code = 118 char = e;code = 101 char = ;code = 32 char = g;code = 103 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = i;code = 105 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = b;code = 98 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = r;code = 114 char = n;code = 110 char = .;code = 46 char = ;code = 32 char = H;code = 72 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = ,;code = 44 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = i;code = 105 char = b;code = 98 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = n;code = 110 char = o;code = 111 char = t;code = 116 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = r;code = 114 char = o;code = 111 char = u;code = 117 char = g;code = 103 char = h;code = 104 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = e;code = 101 char = x;code = 120 char = a;code = 97 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = d;code = 100 char = .;code = 46 char = ;code = 32 char = D;code = 68 char = e;code = 101 char = b;code = 98 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = s;code = 115 char = u;code = 117 char = b;code = 98 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = l;code = 108 char = s;code = 115 char = o;code = 111 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = u;code = 117 char = e;code = 101 char = .;code = 46 char = ;code = 32 char = C;code = 67 char = a;code = 97 char = l;code = 108 char = i;code = 105 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = n;code = 110 char = i;code = 105 char = a;code = 97 char = ;code = 32 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = i;code = 105 char = m;code = 109 char = p;code = 112 char = o;code = 111 char = r;code = 114 char = t;code = 116 char = a;code = 97 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = o;code = 111 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = s;code = 115 char = i;code = 105 char = e;code = 101 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = b;code = 98 char = j;code = 106 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = v;code = 118 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = u;code = 117 char = d;code = 100 char = y;code = 121 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = x;code = 120 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = i;code = 105 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = C;code = 67 char = a;code = 97 char = l;code = 108 char = i;code = 105 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = n;code = 110 char = i;code = 105 char = a;code = 97 char = ;code = 32 char = h;code = 104 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = d;code = 100 char = r;code = 114 char = i;code = 105 char = v;code = 118 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = e;code = 101 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = s;code = 115 char = u;code = 117 char = b;code = 98 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = .;code = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 char = <;code = 60 char = b;code = 98 char = >;code = 62 char = M;code = 77 char = E;code = 69 char = T;code = 84 char = H;code = 72 char = O;code = 79 char = D;code = 68 char = S;code = 83 char = ;code = 32 char = :;code = 58 char = ;code = 32 char = <;code = 60 char = /;code = 47 char = b;code = 98 char = >;code = 62 char = R;code = 82 char = e;code = 101 char = t;code = 116 char = r;code = 114 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = v;code = 118 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = c;code = 99 char = o;code = 111 char = r;code = 114 char = d;code = 100 char = ;code = 32 char = e;code = 101 char = x;code = 120 char = a;code = 97 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = 7;code = 55 char = 0;code = 48 char = 0;code = 48 char = 3;code = 51 char = ;code = 32 char = p;code = 112 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = b;code = 98 char = o;code = 111 char = r;code = 114 char = n;code = 110 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = 1;code = 49 char = 9;code = 57 char = 8;code = 56 char = 7;code = 55 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = o;code = 111 char = ;code = 32 char = w;code = 119 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = n;code = 110 char = r;code = 114 char = o;code = 111 char = l;code = 108 char = l;code = 108 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = C;code = 67 char = a;code = 97 char = l;code = 108 char = i;code = 105 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = n;code = 110 char = i;code = 105 char = a;code = 97 char = ;code = 32 char = D;code = 68 char = e;code = 101 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = D;code = 68 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = l;code = 108 char = o;code = 111 char = p;code = 112 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = S;code = 83 char = e;code = 101 char = r;code = 114 char = v;code = 118 char = i;code = 105 char = c;code = 99 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = t;code = 116 char = w;code = 119 char = e;code = 101 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = 1;code = 49 char = 9;code = 57 char = 9;code = 57 char = 2;code = 50 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 2;code = 50 char = 0;code = 48 char = 0;code = 48 char = 5;code = 53 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = r;code = 114 char = r;code = 114 char = i;code = 105 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = o;code = 111 char = u;code = 117 char = t;code = 116 char = .;code = 46 char = ;code = 32 char = O;code = 79 char = f;code = 102 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = i;code = 105 char = p;code = 112 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = ;code = 32 char = w;code = 119 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = 6;code = 54 char = 3;code = 51 char = 1;code = 49 char = ;code = 32 char = p;code = 112 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = t;code = 116 char = a;code = 97 char = r;code = 114 char = d;code = 100 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = (;code = 40 char = M;code = 77 char = R;code = 82 char = );code = 41 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = o;code = 111 char = ;code = 32 char = s;code = 115 char = u;code = 117 char = b;code = 98 char = s;code = 115 char = e;code = 101 char = q;code = 113 char = u;code = 117 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = q;code = 113 char = u;code = 117 char = i;code = 105 char = r;code = 114 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = u;code = 117 char = t;code = 116 char = c;code = 99 char = o;code = 111 char = m;code = 109 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = b;code = 98 char = a;code = 97 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = q;code = 113 char = u;code = 117 char = i;code = 105 char = r;code = 114 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = u;code = 117 char = l;code = 108 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = b;code = 98 char = a;code = 97 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = d;code = 100 char = e;code = 101 char = l;code = 108 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = p;code = 112 char = o;code = 111 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = l;code = 108 char = o;code = 111 char = a;code = 97 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = i;code = 105 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = e;code = 101 char = s;code = 115 char = .;code = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 char = <;code = 60 char = b;code = 98 char = >;code = 62 char = R;code = 82 char = E;code = 69 char = S;code = 83 char = U;code = 85 char = L;code = 76 char = T;code = 84 char = S;code = 83 char = ;code = 32 char = :;code = 58 char = ;code = 32 char = <;code = 60 char = /;code = 47 char = b;code = 98 char = >;code = 62 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = d;code = 100 char = d;code = 100 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = p;code = 112 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = q;code = 113 char = u;code = 117 char = i;code = 105 char = r;code = 114 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = w;code = 119 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = l;code = 108 char = e;code = 101 char = v;code = 118 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = i;code = 105 char = o;code = 111 char = d;code = 100 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = i;code = 105 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = d;code = 100 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = d;code = 100 char = d;code = 100 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = y;code = 121 char = e;code = 101 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = i;code = 105 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 6;code = 54 char = 8;code = 56 char = ;code = 32 char = [;code = 91 char = 9;code = 57 char = 5;code = 53 char = %;code = 37 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = f;code = 102 char = i;code = 105 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = (;code = 40 char = C;code = 67 char = I;code = 73 char = );code = 41 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 1;code = 49 char = 1;code = 49 char = -;code = 45 char = 2;code = 50 char = .;code = 46 char = 5;code = 53 char = 4;code = 52 char = ];code = 93 char = ,;code = 44 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 5;code = 53 char = 5;code = 53 char = ;code = 32 char = (;code = 40 char = 9;code = 57 char = 5;code = 53 char = %;code = 37 char = ;code = 32 char = C;code = 67 char = I;code = 73 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 0;code = 48 char = 3;code = 51 char = -;code = 45 char = 2;code = 50 char = .;code = 46 char = 3;code = 51 char = 4;code = 52 char = );code = 41 char = ,;code = 44 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 5;code = 53 char = 8;code = 56 char = ;code = 32 char = (;code = 40 char = 9;code = 57 char = 5;code = 53 char = %;code = 37 char = ;code = 32 char = C;code = 67 char = I;code = 73 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 0;code = 48 char = 5;code = 53 char = -;code = 45 char = 2;code = 50 char = .;code = 46 char = 3;code = 51 char = 9;code = 57 char = );code = 41 char = ,;code = 44 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 8;code = 56 char = 2;code = 50 char = ;code = 32 char = (;code = 40 char = 9;code = 57 char = 5;code = 53 char = %;code = 37 char = ;code = 32 char = C;code = 67 char = I;code = 73 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 2;code = 50 char = 3;code = 51 char = -;code = 45 char = 2;code = 50 char = .;code = 46 char = 7;code = 55 char = );code = 41 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 6;code = 54 char = 1;code = 49 char = ;code = 32 char = (;code = 40 char = 9;code = 57 char = 5;code = 53 char = %;code = 37 char = ;code = 32 char = C;code = 67 char = I;code = 73 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 0;code = 48 char = 9;code = 57 char = -;code = 45 char = 2;code = 50 char = .;code = 46 char = 3;code = 51 char = 9;code = 57 char = );code = 41 char = .;code = 46 char = ;code = 32 char = U;code = 85 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = b;code = 98 char = a;code = 97 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = t;code = 116 char = w;code = 119 char = e;code = 101 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = 1;code = 49 char = 9;code = 57 char = 9;code = 57 char = 2;code = 50 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 2;code = 50 char = 0;code = 48 char = 0;code = 48 char = 5;code = 53 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = g;code = 103 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = l;code = 108 char = i;code = 105 char = z;code = 122 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = p;code = 112 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ,;code = 44 char = ;code = 32 char = i;code = 105 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = m;code = 109 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = 2;code = 50 char = 6;code = 54 char = .;code = 46 char = 4;code = 52 char = %;code = 37 char = ;code = 32 char = (;code = 40 char = 9;code = 57 char = 5;code = 53 char = %;code = 37 char = ;code = 32 char = C;code = 67 char = I;code = 73 char = ;code = 32 char = 1;code = 49 char = 6;code = 54 char = .;code = 46 char = 2;code = 50 char = 5;code = 53 char = -;code = 45 char = 3;code = 51 char = 6;code = 54 char = .;code = 46 char = 4;code = 52 char = 8;code = 56 char = );code = 41 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = l;code = 108 char = o;code = 111 char = a;code = 97 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = C;code = 67 char = a;code = 97 char = l;code = 108 char = i;code = 105 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = n;code = 110 char = i;code = 105 char = a;code = 97 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = i;code = 105 char = q;code = 113 char = u;code = 117 char = e;code = 101 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = s;code = 115 char = o;code = 111 char = c;code = 99 char = i;code = 105 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = u;code = 117 char = g;code = 103 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = a;code = 97 char = t;code = 116 char = h;code = 104 char = w;code = 119 char = a;code = 97 char = y;code = 121 char = -;code = 45 char = -;code = 45 char = i;code = 105 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = v;code = 118 char = i;code = 105 char = d;code = 100 char = u;code = 117 char = a;code = 97 char = l;code = 108 char = s;code = 115 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = v;code = 118 char = i;code = 105 char = o;code = 111 char = u;code = 117 char = s;code = 115 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = M;code = 77 char = R;code = 82 char = .;code = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 char = <;code = 60 char = b;code = 98 char = >;code = 62 char = C;code = 67 char = O;code = 79 char = N;code = 78 char = C;code = 67 char = L;code = 76 char = U;code = 85 char = S;code = 83 char = I;code = 73 char = O;code = 79 char = N;code = 78 char = ;code = 32 char = :;code = 58 char = ;code = 32 char = <;code = 60 char = /;code = 47 char = b;code = 98 char = >;code = 62 char = C;code = 67 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = o;code = 111 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = h;code = 104 char = a;code = 97 char = v;code = 118 char = e;code = 101 char = ;code = 32 char = h;code = 104 char = a;code = 97 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = s;code = 115 char = u;code = 117 char = b;code = 98 char = s;code = 115 char = t;code = 116 char = a;code = 97 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = e;code = 101 char = f;code = 102 char = f;code = 102 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = l;code = 108 char = o;code = 111 char = a;code = 97 char = d;code = 100 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = c;code = 99 char = o;code = 111 char = u;code = 117 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = o;code = 111 char = n;code = 110 char = e;code = 101 char = -;code = 45 char = q;code = 113 char = u;code = 117 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = b;code = 98 char = s;code = 115 char = e;code = 101 char = r;code = 114 char = v;code = 118 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = C;code = 67 char = a;code = 97 char = l;code = 108 char = i;code = 105 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = n;code = 110 char = i;code = 105 char = a;code = 97 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = t;code = 116 char = w;code = 119 char = e;code = 101 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = 1;code = 49 char = 9;code = 57 char = 9;code = 57 char = 2;code = 50 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 2;code = 50 char = 0;code = 48 char = 0;code = 48 char = 5;code = 53 char = .;code = 46 result sql = BACKGROUND : Increased autism prevalence rates have generated considerable concern. However, the contribution of changes in diagnostic practices to increased prevalence rates has not been thoroughly examined. Debates over the role of diagnostic substitution also continue. California has been an important test case in these controversies. The objective of this study was to determine the extent to which the increased prevalence of autism in California has been driven by changes in diagnostic practices, diagnostic substitution and diagnostic accretion.METHODS : Retrospective case record examination of 7003 patients born before 1987 with autism who were enrolled with the California Department of Developmental Services between 1992 and 2005 was carried out. Of principal interest were 631 patients with a sole diagnosis of mental retardation (MR) who subsequently acquired a diagnosis of autism. The outcome of interest was the probability of acquiring a diagnosis of autism as a result of changes in diagnostic practices was calculated. The probability of diagnostic change is then used to model the proportion of the autism caseload arising from changing diagnostic practices.RESULTS : The odds of a patient acquiring an autism diagnosis were elevated in periods in which the practices for diagnosing autism changed. The odds of change in years in which diagnostic practices changed were 1.68 [95% confidence interval (CI) 1.11-2.54], 1.55 (95% CI 1.03-2.34), 1.58 (95% CI 1.05-2.39), 1.82 (95% CI 1.23-2.7) and 1.61 (95% CI 1.09-2.39). Using the probability of change between 1992 and 2005 to generalize to the population with autism, it is estimated that 26.4% (95% CI 16.25-36.48) of the increased autism caseload in California is uniquely associated with diagnostic change through a single pathway--individuals previously diagnosed with MR.CONCLUSION : Changes in practices for diagnosing autism have had a substantial effect on autism caseloads, accounting for one-quarter of the observed increase in prevalence in California between 1992 and 2005.
Publication: Int J Epidemiol 2009 Oct ;38(5)::1224-34.
Publication Date: 2009 Oct
Study Author(s): King, Marissa;Bearman, Peter;
Institution: Institute for Social and Economic Research and Policy, Columbia University, New York, NY 10027, USA.
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BACKGROUND : Increased autism prevalence rates have generated considerable concern. However, the contribution of changes in diagnostic practices to increased prevalence rates has not been thoroughly examined. Debates over the role of diagnostic substitution also continue. California has been an important test case in these controversies. The objective of this study was to determine the extent to which the increased prevalence of autism in California has been driven by changes in diagnostic practices, diagnostic substitution and diagnostic accretion.METHODS : Retrospective case record examination of 7003 patients born before 1987 with autism who were enrolled with the California Department of Developmental Services between 1992 and 2005 was carried out. Of principal interest were 631 patients with a sole diagnosis of mental retardation (MR) who subsequently acquired a diagnosis of autism. The outcome of interest was the probability of acquiring a diagnosis of autism as a result of changes in diagnostic practices was calculated. The probability of diagnostic change is then used to model the proportion of the autism caseload arising from changing diagnostic practices.RESULTS : The odds of a patient acquiring an autism diagnosis were elevated in periods in which the practices for diagnosing autism changed. The odds of change in years in which diagnostic practices changed were 1.68 [95% confidence interval (CI) 1.11-2.54], 1.55 (95% CI 1.03-2.34), 1.58 (95% CI 1.05-2.39), 1.82 (95% CI 1.23-2.7) and 1.61 (95% CI 1.09-2.39). Using the probability of change between 1992 and 2005 to generalize to the population with autism, it is estimated that 26.4% (95% CI 16.25-36.48) of the increased autism caseload in California is uniquely associated with diagnostic change through a single pathway--individuals previously diagnosed with MR.CONCLUSION : Changes in practices for diagnosing autism have had a substantial effect on autism caseloads, accounting for one-quarter of the observed increase in prevalence in California between 1992 and 2005.
PMID: 19737791