Study characteristics for inception cohorts.

1Easterbrook et al assumed that only studies that had been analysed had the potential for being written up and published, so tests for study publication bias were restricted to these.2Studies for which there was a full interview by the researchers of the cohort study and for which information on the nature of results and publication was provided.3Of the 520 studies with completed questionnaires, 321 had analysis undertaken with results available and were included in further analysis of the association between study outcome and time to publication.4Both groups are not mutually exclusive. 4% had a statement of both sources of funding. In the remainder, the protocols did not include information on how study was funded.NI No information available.