Table 2

Proportion of studies with significant or positive results in studies included in cohort studies of publication bias

Positive results

Cohort category

%

Total

Inception

63.0%

2,194

Regulatory

71.9%

855

Abstract

59.4%

10,288

Manuscript

70.9%

2,636

Song et al. BMC Medical Research Methodology 2009 9:79   doi:10.1186/1471-2288-9-79