Research article
Extent of publication bias in different categories of research cohorts: a meta-analysis of empirical studies
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* Corresponding author: Fujian Song Fujian.Song@uea.ac.uk
1 School of Medicine, Health Policy and Practice, University of East Anglia, Earlham Road, Norwich, NR4 7TJ, UK
2 School of Allied Health Professions, University of East Anglia, Earlham Road, Norwich, NR4 7TJ, UK
3 Department of Health Sciences, University of Leicester, University Road, Leicester, LE1 7RH, UK
4 Watford General Hospital, 60 Vicarage Road, Watford, Hertfordshire, WD18 0HB, UK
BMC Medical Research Methodology 2009, 9:79 doi:10.1186/1471-2288-9-79
Published: 26 November 2009Additional files
Additional file 1:
Literature search strategies. Strategies used to search MEDLINE and Cochrane Methodology Register for relevant empirical and methodological studies on publication bias.
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Additional file 2:
Main characteristics of inception cohort studies. Shows the main characteristics of studies that followed up cohorts of research from the beginning, including research approved by research ethics committee and those registered by research funding bodies.
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Additional file 3:
Main characteristics of regulatory cohort studies. Shows the main characteristics of studies that followed up trials submitted to regulatory authorities.
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Additional file 4:
Main characteristics of abstract cohort studies. Shows the main characteristics of studies that followed up abstracts presented at conferences.
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Additional file 5:
Main characteristics of manuscript cohort studies. Shows the main characteristics of studies that followed up cohorts of manuscripts submitted to journals for publication.
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