Abstract:
OBJECTIVES:To compare the frequency of discrepancies in retracted reports of clinical trials with those in adjacent unretracted reports in the same journal. DESIGN:Blinded case-control study. SETTING:Journals in PubMed. POPULATION:50 manuscripts, classified on PubMed as retracted clinical trials, paired with 50 adjacent unretracted manuscripts from the same journals. Reports were randomly selected from PubMed in December 2012, with no restriction on publication date. Controls were the preceding unretracted clinical trial published in the same journal. All traces of retraction were removed. Three scientists, blinded to the retraction status of individual reports, reviewed all 100 trial reports for discrepancies. Discrepancies were pooled and cross checked before being counted into prespecified categories. Only then was the retraction status unblinded for analysis. MAIN OUTCOME MEASURE:Total number of discrepancies (defined as mathematically or logically contradictory statements) in each clinical trial report. RESULTS:Of 479 discrepancies found in the 100 trial reports, 348 were in the 50 retracted reports and 131 in the 50 unretracted reports. On average, individual retracted reports had a greater number of discrepancies than unretracted reports (median 4 (interquartile range 2-8.75) v 0 (0-5); P<0.001). Papers with a discrepancy were significantly more likely to be retracted than those without a discrepancy (odds ratio 5.7 (95% confidence interval 2.2 to 14.5); P<0.001). In particular, three types of discrepancy arose significantly more frequently in retracted than unretracted reports: factual discrepancies (P=0.002), arithmetical errors (P=0.01), and missed P values (P=0.02). Results from a retrospective analysis indicated that citations and journal impact factor were unlikely to affect the result. CONCLUSIONS:Discrepancies in published trial reports should no longer be assumed to be unimportant. Scientists, blinded to retraction status and with no specialist skill in the field, identify significantly more discrepancies in retracted than unretracted reports of clinical trials. Discrepancies could be an early and accessible signal of unreliability in clinical trial reports.
journal_name
BMJjournal_title
BMJ (Clinical research ed.)authors
Cole GD,Nowbar AN,Mielewczik M,Shun-Shin MJ,Francis DPdoi
10.1136/bmj.h4708subject
Has Abstractpub_date
2015-09-20 00:00:00pages
h4708eissn
0959-8138issn
1756-1833journal_volume
351pub_type
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journal_title:BMJ (Clinical research ed.)
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journal_title:BMJ (Clinical research ed.)
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更新日期:2012-09-06 00:00:00
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doi:10.1136/bmj.308.6932.824
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doi:10.1136/bmj.312.7029.501
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更新日期:2006-06-17 00:00:00
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pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2013-07-12 00:00:00
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更新日期:2019-11-06 00:00:00
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更新日期:2013-02-04 00:00:00
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更新日期:2018-11-06 00:00:00
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更新日期:2012-08-08 00:00:00