Document Detail

The effect of english-language restriction on systematic review-based meta-analyses: a systematic review of empirical studies.
MedLine Citation:
PMID:  22559755     Owner:  NLM     Status:  In-Data-Review    
Objectives: The English language is generally perceived to be the universal language of science. However, the exclusive reliance on English-language studies may not represent all of the evidence. Excluding languages other than English (LOE) may introduce a language bias and lead to erroneous conclusions.Study Design and Setting: We conducted a comprehensive literature search using bibliographic databases and grey literature sources. Studies were eligible for inclusion if they measured the effect of excluding randomized controlled trials (RCTs) reported in LOE from systematic review-based meta-analyses (SR/MA) for one or more outcomes.Results: None of the included studies found major differences between summary treatment effects in English-language restricted meta-analyses and LOE-inclusive meta-analyses. Findings differed about the methodological and reporting quality of trials reported in LOE. The precision of pooled estimates improved with the inclusion of LOE trials.Conclusions: Overall, we found no evidence of a systematic bias from the use of language restrictions in systematic review-based meta-analyses in conventional medicine. Further research is needed to determine the impact of language restriction on systematic reviews in particular fields of medicine.
Andra Morrison; Julie Polisena; Don Husereau; Kristen Moulton; Michelle Clark; Michelle Fiander; Monika Mierzwinski-Urban; Tammy Clifford; Brian Hutton; Danielle Rabb
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of technology assessment in health care     Volume:  28     ISSN:  1471-6348     ISO Abbreviation:  Int J Technol Assess Health Care     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-05-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508113     Medline TA:  Int J Technol Assess Health Care     Country:  England    
Other Details:
Languages:  eng     Pagination:  138-44     Citation Subset:  IM    
Canadian Agency for Drugs and Technologies in Health.
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