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char = c;code = 99
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result sql = Diagnostic change and the increased prevalence of autism.
Diagnostic change and the increased prevalence of autism.
char = <;code = 60
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char = A;code = 65
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char = K;code = 75
char = G;code = 71
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char = O;code = 79
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char = e;code = 101
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char = i;code = 105
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char = e;code = 101
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char = e;code = 101
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char = T;code = 84
char = h;code = 104
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char = c;code = 99
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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
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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.
Shortcut link to this study:
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

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