Figure 4.

The mean difference in BLL between male and female participants. The mean BLL in the exposed males was higher than that in the female participants (weighted mean difference: 2.45, p < 0.0001, 95% CI: 1.11–3.80, I²: 95.8%) (white diamond symbol). WMD: Weighted Mean Difference (µg/dL), % Weighted: the impact proportion of each study to the pooled effect, CI: Confidence Interval (µg/dL), Black diamond symbol: point estimate for each study, White diamond symbol: pooled WMD in each subgroup or all groups, Solid line in the middle of the graph at 0: no difference in WMD between the two groups, Dashed line: pooled WMD between the two groups.