Figure 3
Forest plot for association between occupational Pb exposure and blood calcium levels. (Legends/footnotes): forest plot revealing the group mean differences in serum calcium (A) and ionised calcium (B) levels in mg/dl between the occupationally Pb exposed workers and control participants. The square and whisker (horizontal lines) represent respectively the mean difference and 95% confidence interval of individual studies. The length and width of the diamond indicate respectively the pooled mean difference and 95% confidence interval derived from random-effect analysis.
