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result sql = Comparison of methods of handling missing data in individual patient data meta-analyses: an empirical example on antibiotics in children with acute otitis media.
Comparison of methods of handling missing data in individual patient data meta-analyses: an empirical example on antibiotics in children with acute otitis media.
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char = p;code = 112
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char = t;code = 116
char = a;code = 97
char = t;code = 116
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char = e;code = 101
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char = i;code = 105
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char = ;code = 32
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char = i;code = 105
char = a;code = 97
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char = e;code = 101
char = s;code = 115
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = g;code = 103
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char = t;code = 116
char = ;code = 32
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char = f;code = 102
char = f;code = 102
char = e;code = 101
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char = c;code = 99
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = s;code = 115
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 = l;code = 108
char = u;code = 117
char = d;code = 100
char = e;code = 101
char = d;code = 100
char = ;code = 32
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char = t;code = 116
char = u;code = 117
char = d;code = 100
char = i;code = 105
char = e;code = 101
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char = ;code = 32
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char = t;code = 116
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char = ;code = 32
char = g;code = 103
char = a;code = 97
char = i;code = 105
char = n;code = 110
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char = i;code = 105
char = n;code = 110
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char = s;code = 115
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = o;code = 111
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char = e;code = 101
char = r;code = 114
char = ,;code = 44
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = p;code = 112
char = u;code = 117
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char = a;code = 97
char = t;code = 116
char = i;code = 105
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char = r;code = 114
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char = a;code = 97
char = l;code = 108
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char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
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char = ;code = 32
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char = c;code = 99
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char = e;code = 101
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char = ;code = 32
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char = m;code = 109
char = p;code = 112
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char = r;code = 114
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char = l;code = 108
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char = p;code = 112
char = l;code = 108
char = e;code = 101
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char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
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char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = n;code = 110
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char = t;code = 116
char = r;code = 114
char = i;code = 105
char = a;code = 97
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char = s;code = 115
char = ;code = 32
char = a;code = 97
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char = p;code = 112
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = p;code = 112
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = p;code = 112
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = p;code = 112
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = d;code = 100
char = a;code = 97
char = t;code = 116
char = a;code = 97
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
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 = ;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 = d;code = 100
char = a;code = 97
char = t;code = 116
char = a;code = 97
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = -;code = 45
char = a;code = 97
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = s;code = 115
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
result sql = What is the influence of various methods of handling missing data (complete case analyses, single imputation within and over trials, and multiple imputations within and over trials) on the subgroup effects of individual patient data meta-analyses? An empirical data set was used to compare these five methods regarding the subgroup results. Logistic regression analyses were used to determine interaction effects (regression coefficients, standard errors, and p values) between subgrouping variables and treatment. Stratified analyses were performed to determine the effects in subgroups (rate ratios, rate differences, and their 95% confidence intervals). Imputation over trials resulted in different regression coefficients and standard errors of the interaction term as compared with imputation within trials and complete case analyses. Significant interaction effects were found for complete case analyses and imputation within trials, whereas imputation over trials often showed no significant interaction effect. Imputation of missing data over trials might lead to bias, because association of covariates might differ across the included studies. Therefore, despite the gain in statistical power, imputation over trials is not recommended. In the authors' empirical example, imputation within trials appears to be the most appropriate approach of handling missing data in individual patient data meta-analyses.

Publication: Am. J. Epidemiol. 2008 Mar 1 ;167(5)::540-5. :doi: 10.1093/aje/kwm341.
Publication Date: 2008 Mar 1
Study Author(s): Koopman, Laura;van der Heijden, Geert J M G;Grobbee, Diederick E;Rovers, Maroeska M;
Institution: Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands. [email protected]
Shortcut link to this study:
What is the influence of various methods of handling missing data (complete case analyses, single imputation within and over trials, and multiple imputations within and over trials) on the subgroup effects of individual patient data meta-analyses? An empirical data set was used to compare these five methods regarding the subgroup results. Logistic regression analyses were used to determine interaction effects (regression coefficients, standard errors, and p values) between subgrouping variables and treatment. Stratified analyses were performed to determine the effects in subgroups (rate ratios, rate differences, and their 95% confidence intervals). Imputation over trials resulted in different regression coefficients and standard errors of the interaction term as compared with imputation within trials and complete case analyses. Significant interaction effects were found for complete case analyses and imputation within trials, whereas imputation over trials often showed no significant interaction effect. Imputation of missing data over trials might lead to bias, because association of covariates might differ across the included studies. Therefore, despite the gain in statistical power, imputation over trials is not recommended. In the authors' empirical example, imputation within trials appears to be the most appropriate approach of handling missing data in individual patient data meta-analyses.
PMID: 18184640

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