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Meta-analysis of three prospective cohort studies evaluating mercury exposure and incident diabetes. Cohort-specific HRs in the top quintile of toenail mercury concentrations, compared with the lowest quintile, are shown and were combined using random-effects meta-analysis with inverse-variance weights. Using fixed-effects meta-analysis, the pooled HR (95% CI) was 0.95 (0.78–1.17). Heterogeneity was evident (I2 75.4%).
