Imputing missing standard deviations in meta-analyses can provide accurate results

Altman, 2000 Clarke, 2003 Guaiana, 2004, Amitriptyline versus other types of pharmacotherapy for depression (Cochrane Review) Cipriani, 2004, Fluoxetine versus other types of pharmacotherapy for depression Hamilton, 1960, A rating scale for depression, J Neurol Neurosurg Psychiatry, 23, 56, 10.1136/jnnp.23.1.56 Joffe, 1996, Antidepressant treatment of depression: a metaanalysis, Can J Psychiatry, 41, 613, 10.1177/070674379604101002 Lachenbruch, 1975 DerSimonian, 1986, Meta-analysis in clinical trials, Control Clin Trials, 7, 177, 10.1016/0197-2456(86)90046-2 Furukawa, 2002, Can we individualize the number needed to treat (NNT)? An empirical study of summary effect measures in meta-analyses, Int J Epidemiol, 31, 74, 10.1093/ije/31.1.72 Fleiss, 2003 SPSS Inc., 2001 2003 Montgomery, 1979, A new depression scale designed to be sensitive to change, Br J Psychiatry, 134, 382, 10.1192/bjp.134.4.382 Follmann, 1992, Variance imputation for overviews of clinical trials with continuous response, J Clin Epidemiol, 45, 769, 10.1016/0895-4356(92)90054-Q Altman, 2001, The revised CONSORT statement for reporting randomized trials: explanation and elaboration, Ann Intern Med, 134, 663, 10.7326/0003-4819-134-8-200104170-00012 Hedges, 1991, Directions for future methodology Sterne, 2000, Publication and related bias in meta-analysis: power of statistical tests and prevalence in the literature, J Clin Epidemiol, 53, 1119, 10.1016/S0895-4356(00)00242-0 Furukawa, 2003, Antidepressant plus benzodiazepine for major depression