PON1 and type 2 diabetes mellitus: In the overall population, the pooled meta‐analysis revealed that there were no significant associations between the PON1 Q912R genetic polymorphism and T2DM under all genetic models: allelic (OR = 1.02, 95% CI = 0.87–1.20; P = 0.786), homozygous (OR = 1.08, 95% CI = 0.81–1.45; P = 0.596), heterozygous (OR = 0.93, 95% CI = 0.75–1.17; P = 0.544), recessive (OR = 1.12, 95% CI = 0.92–1.35; P = 0.259) and dominant (OR = 0.99, 95% CI = 0.78–1.26; P = 0.921).