Harshavardhana 2009a.

Methods	Identification of subsequent full‐length publications Searched electronic database PubMed to December 2008 Person completing the search not reported Search criteria not reported Matched abstract to full‐length publication by Study cohort Design Conclusion Authorship
Data	Included 1063 abstracts presented at the 2000 to 2004 Scoliosis Research Society meetings Included all abstracts
Comparisons	Proportion of abstracts published, overall and by meeting Oral versus poster presentation
Outcomes	560 of 1063 abstracts published 98/210 abstracts presented at the 2000 meeting, 97/166 at the 2001 meeting, 106/214 at the 2002 meeting, 137/259 at the 2003 meeting, and 92/214 at the 2004 meeting published Proportion of abstracts published by time not reported Factors related to proportion of abstracts published included 295/452 abstracts presented orally versus 265/611 abstracts presented as posters published
Notes	Orthopedics/orthopedic surgery ‐ scoliosis Funding not reported Data extracted from abstract
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 48 months follow‐up.
Matching?	Yes	Matched by 4 different criteria.
Adjustment for confounding?	No	Examined association of meeting year by type presentation with publication using stratified analysis and unspecified statistical tests.