Harshavardhana 2009.

Methods	Identification of subsequent full‐length publications Searched electronic database PubMed to May 2009 Person completing the search not reported Search criteria not reported Matched abstract to full‐length publication by All authors Sample Size Contents Methodology Results Level of evidence Conclusions Conflict of interest
Data	Included 278 abstracts presented at the 2000 to 2004 Cervical Spine Research Society meetings Included all abstracts presented orally
Comparisons	Proportion of abstracts published, overall and by meeting Cumulative proportion of abstracts published
Outcomes	203 of 278 abstracts published 43/59 abstracts presented at the 2000 meeting, 30/51 at the 2001 meeting, 43/58 at the 2002 meeting, 48/57 at the 2003 meeting, and 39/53 at the 2004 meeting published Proportion of abstracts published by time Cumulative proportion of abstracts published at 24 months showed proportion published = 55.4% (154/278 abstracts) No factors other than meeting year related to proportion of abstracts published reported
Notes	Orthopedics/orthopedic surgery Funding not reported Data extracted from abstract
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts presented orally.
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 8 different criteria.
Adjustment for confounding?	No	Examined association of meeting year with publication using stratified analysis