Patel 2011.

Methods	Identification of subsequent full‐length publications Searched electronic database PubMed to May 2010 Person completing the search not reported Searched by all authors and keywords Matched abstract to full‐length publication by All authors Title Contents Conclusions
Data	Included 3827 abstracts presented at the 2003 to 2005 Congress of Neurological Surgeons and American Association of Neurological Surgeons meetings Included all abstracts
Comparisons	Proportion of abstracts published, overall and by meeting Cumulative proportion of abstracts published Oral versus poster presentation
Outcomes	1243 of 3827 abstracts published 221/651 abstracts presented at the 2003 American Association of Neurological Surgeons meeting, 193/620 at the 2004 American Association of Neurological Surgeons meeting, 196/634 at the 2005 American Association of Neurological Surgeons meeting, 209/605 at the 2003 Congress of Neurological Surgeons meeting, 200/565 at the 2004 Congress of Neurological Surgeons meeting, and 224/752 at the 2005 Congress of Neurological Surgeons meeting published Proportion of abstracts published by time Cumulative proportion of abstracts published at 60 months showed proportion published = 32.7% (628/1922 abstracts) for Congress of Neurological Surgeons meetings Cumulative proportion of abstracts published at 60 months showed proportion published = 31.4% (599/1905 abstracts) for American Association of Neurological Surgeons meetings Factors related to proportion of abstracts published included 445/1078 abstracts presented orally versus 798/2749 abstracts presented as posters published
Notes	Surgery ‐ neurologic surgery 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?	Yes	All meetings had at least 5 years follow‐up.
Matching?	Yes	Matched by 4 different criteria.
Adjustment for confounding?	No	Examined association of meeting by type presentation with publication using stratified analysis.