Yilmaz 2013.

Methods	Identification of subsequent full‐length publications Searched electronic database PubMed on 20 January, 2011 Person completing the search not reported Searched by all authors Matching criteria not reported
Data	Included 1732 abstracts presented at the 2008 European League Against Rheumatism meeting Included all abstracts
Comparisons	Proportion of abstracts published Median time to publication Oral versus poster presentation Clinical research versus preclinical research RCT design versus non‐RCT design Multi‐centered versus single center Sample size Type disease
Outcomes	601 of 1732 abstracts published Proportion of abstracts published by time Median time to publication = 13 months (range = 0 to 31 months) Factors related to proportion of abstracts published included 119/270 abstracts presented orally versus 482/1462 abstracts presented as poster published 393/1168 abstracts describing clinical research versus 208/564 abstracts describing preclinical research published 65/144 abstracts describing RCTs versus 328/1024 abstracts describing other research designs published 265/590 abstracts with multiple centers versus 336/1042 abstracts with a single center published Sample size (higher than median vs. lower than median: 36.2% vs. 30.3%, P = 0.017)
Notes	Rheumatology Funding not reported
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts.
Search for publications?	No	Searched only 1 database.
Follow‐up time?	No	The meeting only had 36 months follow‐up.
Matching?	Unclear	Matching criteria not reported.
Adjustment for confounding?	No	Examined association of type of presentation, study design, multi‐center status, sample size, and type disease with publication using stratified analysis and Chi2, Mann‐Whitney U, and ANOVA tests.