ObjectiveTo calculate the typical time taken to complete protocols and reviews, to track how often reviews are updated and compare with Collaboration policies, to feed back any gaps in documentation of dates to individual Cochrane Collaborative Review Groups, and to suggest changes to presentation of reviews and to editorial processes.MethodsData were extracted either from The Cochrane Library or a specially constructed database to calculate the age of reviews and protocols, and the frequency of updating of reviews. Issue 1, 2003, with 1 596 reviews and 1 200 protocols, was used as the index issue.ResultsMedian number of issues between a protocol and its completed review being published on The Cochrane Library is 5 (1.25 years). 65

来源：中国循证医学杂志 2004 年 4卷 7期