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The objective of the study was to assess the prevalence, the reporting quality, the need, and the consequences of contacting of authors by Cochrane reviewers to obtain additional information for their reviews.

Cross-sectional study and survey on all new Cochrane intervention reviews published between January 1, 2016 and January 31, 2017.

The cross-sectional study found that reviewers had contacted or had tried to contact studies to obtain additional information in 73.4% (234/319) of reviews but reported poorly on the methods, outcomes, and consequences of this procedure. Most eligible studies in the reviews were poorly reported, but few reviewers 21.2% (65/306) reported that they had contacted these studies. The survey showed that risk of bias scores, Grading of Recommendations, Assessment, Development and Evaluation scores, the summary primary or …