Costa 2009.

Methods	Identification of subsequent full‐length publications Searched electronic database MEDLINE; date of search not reported Person completing the search not reported Searched by first, second, and last author Matching criteria not reported
Data	Included 1620 abstracts presented at the 2002 American Society of Clinical Oncology, San Antonio Breast Cancer Symposium, European Breast Cancer Conference, and European Society for Medical Oncology meetings Included all abstracts related to breast cancer
Comparisons	Proportion of abstracts published Median time to publication Survival analysis of publication rate overall and by meeting Presentation at a North American versus European meeting
Outcomes	721 of 1620 abstracts published Proportion of abstracts published by time Median time to publication = 11.6 months (95% CI = 7.6 to 15.7 months) Survival analysis of proportion published at 60 months = 44.5% Survival analysis of proportion published at 60 month for North American meetings = 52.2% and for European meetings = 32.5% Factors related to proportion of abstracts published included 52.7% of abstracts presented at a North American meeting versus 33.3% of abstracts presented at a European meeting published
Notes	Oncology ‐ breast cancer Funding not reported Data extracted from abstract
Risk of bias
Item	Authors' judgement	Description
Sampling method?	Yes	Included all abstracts that described a specific topic, so low risk of bias.
Search for publications?	No	Searched only 1 database.
Follow‐up time?	Unclear	Date of search not reported.
Matching?	Unclear	Matching criteria not reported.
Adjustment for confounding?	No	Examined association of country of origin with publication using stratified analysis and unspecified statistical tests.