Dahllof 2008.

Methods	Identification of subsequent full‐length publications Searched electronic database MEDLINE, PubMed from 1999 through December 2006 Person completing the search not reported Searched by first, second, and last author, and keywords Matched abstract to full‐length publication by All authors Sample size Results Hypothesis
Data	Included 771 abstracts presented at the 1999 and 2001 International Association of Paediatric Dentistry meetings Included all abstracts except pre‐congress course, lectures, and symposia
Comparisons	Proportion of abstracts published Mean and median time to publication Cumulative proportion of abstracts published Oral versus poster presentation Clinical research versus basic science research versus 'other' research RCT design versus observational versus case report design US versus European versus Asian versus South American origin for countries contributing more than 20 abstracts Subspecialty
Outcomes	204 of 771 abstracts published Proportion of abstracts published by time Mean time to publication = 20 months (SD = 20) Median time to publication = 18 months Cumulative proportion of abstracts published at 80 months showed proportion published = 26.5% (204/771 abstracts) Factors related to proportion of abstracts published included 92/231 abstracts presented orally versus 110/539 abstracts presented as posters published 157/572 abstracts describing clinical research versus 40/146 abstracts describing basic science research versus 7/53 abstracts describing 'other' research published 24/47 abstracts with RCT design versus 113/373 abstracts with observational design versus 20/152 abstracts of case report design published 10/30 abstracts originating from the USA versus 91/259 abstracts from Europe versus 16/88 abstracts from Asia versus 8/81 abstracts from South America published (for countries submitting 20 or more abstracts); 79/343 abstracts published from countries submitting less than 20 abstracts
Notes	Oral health ‐ pediatric dentistry Funding not reported
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all posters with reasonable exceptions.
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?	Yes	Examined association of type presentation, type science, study design, US origin, and subspecialty with publication using multivariable logistic regression analysis.