Ozkösem 2013.

Methods	Identification of subsequent full‐length publications Searched electronic database Web of Science and Harzing's Publish or Perish algorithm to June 2013 Person completing the search not reported Search criteria not reported Matching criteria not reported
Data	Included 943 abstracts presented at the 2005 to 2006 Society for Free Radical Biology and Medicine meetings Included all abstracts
Comparisons	Proportion of abstracts published Basic science Number of authors Country of origin Institution
Outcomes	398 of 943 abstracts published Proportion of abstracts published by time not reported Factors related to proportion of abstracts published included Basic science = OR 3.6 (95% CI: 3.1 to 6.4) Number of authors = OR 1.2 (95% CI: 1.0 to 1.3)
Notes	Other non‐clinical specialties ‐free radical biology and medicine Funding not reported Data extracted from abstract
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts.
Search for publications?	Yes	Searched 2 databases.
Follow‐up time?	Yes	All meetings had at least 48 months follow‐up.
Matching?	Unclear	Matching criteria not reported.
Adjustment for confounding?	Yes	Examined association of type science, number of authors, country of origin, and institution with publication using multivariable logistic regression analyses.