Fig. 4

Funnel plot of partial correlation coefficients. This figure displays a funnel plot of partial correlation coefficients of estimates of the gender dummy variable reported in 53 research works listed in Additional file 1: Table S1 and Additional file 2: Bibliography of studies subject to meta-analysis as the dependent variable. See Table 1 for the descriptive statistics of the estimates. The solid line indicates the synthesized effect size by WAAP estimation as reported in Table 2