Table 1 Unadjusted association of seven meta-analysis characteristics and the magnitude of BoS in a bivariate meta-analysis of two binary outcomes

Number of studies

0.19

<0.001

0.09 to 0.29

Number of studies with outcome of interest

0.17

0.013

0.04 to 0.31

Number of studies with both outcomes

0.36

0.001

0.15 to 0.57

Percentage of studies missing either outcome

0.49

<0.001

0.24 to 0.74

Percentage of studies missing the outcome corresponding to the BoS value

0.52

<0.001

0.38 to 0.67

Average absolute within-study correlation

28.36

<0.001

14.37 to 42.35

Largest absolute within-study correlation

29.08

<0.001

16.30 to 41.85