Registration practices for observational studies on ClinicalTrials.gov indicated low adherence

详细信息    查看全文

• 作者：Stefania Boccia^a ; ^{sboccia@rm.unicatt.it" class="auth_mail" title="E-mail the corresponding author} ; Kenneth J. Rothman^b ; ^c ; Nikola Panic^a ; Maria Elena Flacco^d ; ^e ; Annalisa Rosso^f ; Roberta Pastorino^a ; Lamberto Manzoli^d ; ^g ; Carlo La Vecchia^h ; Paolo Villari^f ; Paolo Boffettaⁱ ; Walter Ricciardi^a ; John P.A. Ioannidis^j ; ^k ; ^l ; ^m
• 关键词：Outcome reporting bias ; Registration of observational studies ; ClinicalTrials.gov ; Protocol registration ; Registration study records ; Cancer protocol registration
• 刊名：Journal of Clinical Epidemiology
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：70
• 期：Complete
• 页码：176-182
• 全文大小：469 K

文摘

The study aims to assess the status of registration of observational studies.

Study Design and Setting

We identified studies on cancer research with prospective recruitment of participants that were registered from February 2000 to December 2011 in ClinicalTrials.gov. We recorded the dates of registration and start of recruitment, outcomes, and description of statistical method. We searched for publications corresponding to the registered studies through May 31, 2014.

Results

One thousand one hundred nine registered studies were eligible. Primary and secondary outcomes were reported in 809 (73.0%) and 464 (41.8%) of them. The date of registration preceded the month of the study start in 145 (13.8%) and coincided in 205 (19.5%). A total of 151 publications from 120 (10.8%) registered studies were identified. In 2 (33.3%) of the 6 publications where ClinicalTrials.gov reported that the study started recruitment after registration, and in 9 (50.0%) of 18 publications where ClinicalTrials.gov reported the same date for registration and start of recruitment, the articles showed that the study had actually started recruiting before registration.

Conclusion

During the period reviewed, few observational studies have been registered. Registration usually occurred after the study started, and prespecification of outcomes and statistical analysis rarely occurred.