Diezel 1999.

Methods	Identification of subsequent full‐length publications Searched electronic database MEDLINE (from 1966 through 1996), PsychLIT (from 1974 to 1996), Embase (from 1988 through 1985), Biological abstracts (from 1985 through 1996), ISI (from 1981 through 1996), Cochrane Central Register of Controlled Trials (from 1996 through 1998) Person completing the search not reported Searched by all authors and keywords Matching criteria not reported
Data	Included 95 abstracts presented at the 1971 Vth World Congress of Psychiatry meeting Included RCT abstracts
Comparisons	Proportion of abstracts published Cumulative proportion of abstracts published English versus non‐English language
Outcomes	44 of 95 abstracts published Proportion of abstracts published by time Cumulative proportion of abstracts published at 84 months = 46.3% (44/95 abstracts) Factors related to proportion of abstracts published included 32/58 abstracts with English language versus 12/37 abstracts with non‐English language published
Notes	Psychiatry Funding by Amt fur Ausbildungsförderung, Nordrhein‐Westfahlen, Germany, the Medical Research Council, and Anglia and Oxford Regional Health Authority, UK
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts that described RCTs.
Search for publications?	Yes	Searched 6 databases.
Follow‐up time?	Yes	The meeting had at least 14 years follow up.
Matching?	Unclear	Matching criteria not reported.
Adjustment for confounding?	No	Examined origin in English language country with publication using stratified analysis and unspecified statistical tests.