Document Detail

Rationale for unequal randomization in clinical trials is rarely reported: a systematic review.
MedLine Citation:
PMID:  25201357     Owner:  NLM     Status:  Publisher    
OBJECTIVES: To assess the reporting of the unequal randomization ratio in reports of trials with this design and to identify the justification for the design.
STUDY DESIGN AND SETTING: Systematic review of reports of trials with unequal randomization. We selected all original reports of two parallel-group randomized controlled trials with unequal randomization, which were published in 2009 and 2010 in core clinical journals in MEDLINE on the basis of the abstract (and full text, if necessary). Additional information was collected by an author survey.
RESULTS: We retrieved 106 reports (prevalence, 4.7%). The randomization ratio was not stated in 8.5% of reports and 51.9% of abstracts. Sample size calculation was reported in 70 reports, with unequal randomization not taken into account in 25.7% (n = 18). Justification for unequal randomization was not reported in 77.4% (n = 82) of reports. Combining information from reports and author surveys, we had justification for 41 trials. The main justification was safety issues for 20 trials. In 11 of those latter 20 reports, adverse events were not fully reported.
CONCLUSION: A better reporting of the randomization ratio, sample size calculation, and justification to unequal randomization could help readers appraise the quality and risk of bias of such trials.
Clarisse Dibao-Dina; Agnès Caille; Bénédicte Sautenet; Emilie Chazelle; Bruno Giraudeau
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Publication Detail:
Type:  REVIEW    
Journal Detail:
Title:  Journal of clinical epidemiology     Volume:  67     ISSN:  1878-5921     ISO Abbreviation:  J Clin Epidemiol     Publication Date:  2014 Oct 
Date Detail:
Created Date:  2014-9-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8801383     Medline TA:  J Clin Epidemiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1070-1075     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier Inc. All rights reserved.
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