A case study of pooled-studies publications indicated potential for both valuable information and bias

作者：Thaler Kylie J^*; Morgan Laura C; Van Noord Megan; Jonas Daniel E; McDonagh Marian S; Peterson Kimberly; Glechner Anna; Gartlehner Gerald

来源：Journal of Clinical Epidemiology, 2013, 66(10): 1082-1092.

DOI：10.1016/j.jclinepi.2013.05.002

• Systematic review
• Bias
• Pooling
• Antidepressants
• Depression
• Subgroups

Objectives: Pooled-studies publications (PSPs) present statistical analyses of multiple randomized controlled trials without a systematic literature search or critical appraisal. We explored the characteristics of PSPs and their potential impact on a systematic review (SR). %26lt;br%26gt;Study Design and Setting: We systematically evaluated PSPs excluded from an SR of second-generation antidepressants. We analyzed their basic characteristics, risk of bias, and the effect of new data on review conclusions. %26lt;br%26gt;Results: We identified 57 PSPs containing a median of five trials (range, 2-11) and 1,233 patients (range, 117-2,919). Ninety-six percent of PSPs were industry funded, and 49% of PSPs contained unpublished data. The median number of citations for PSPs was 29 (range, 0-549). Only 7% planned pooling a priori, and 19% combined trials with identical protocols. Fifty-nine percent of PSPs eligible for general efficacy provided no new data. For some subgroups and accompanying symptoms (e.g., anxiety, insomnia, melancholia, fatigue, sex, and race), more than 30% of PSPs presented entirely new data or data that could alter the strength of the evidence available in the SR. %26lt;br%26gt;Conclusion: In this case study, PSPs provided new information on subgroups and secondary outcomes; however, guidance for reviewers and development of a system to assess their susceptibility to bias are required.

• 出版日期2013-10