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Design and Analysis of Group-Randomized Trials: A Review of Recent Practices
Author(s) -
Sherri P. Varnell,
David M. Murray,
Jessica B. Janega,
Jonathan Blitstein
Publication year - 2004
Publication title -
american journal of public health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.284
H-Index - 264
eISSN - 1541-0048
pISSN - 0090-0036
DOI - 10.2105/ajph.94.3.393
Subject(s) - randomized controlled trial , medicine , public health , family medicine , medline , sample size determination , subgroup analysis , meta analysis , statistics , pathology , mathematics , political science , law
We reviewed group-randomized trials (GRTs) published in the American Journal of Public Health and Preventive Medicine from 1998 through 2002 and estimated the proportion of GRTs that employ appropriate methods for design and analysis. Of 60 articles, 9 (15.0%) reported evidence of using appropriate methods for sample size estimation. Of 59 articles in the analytic review, 27 (45.8%) reported at least 1 inappropriate analysis and 12 (20.3%) reported only inappropriate analyses. Nineteen (32.2%) reported analyses at an individual or subgroup level, ignoring group, or included group as a fixed effect. Hence increased vigilance is needed to ensure that appropriate methods for GRTs are employed and that results based on inappropriate methods are not published.

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