KCNQ1 and type 2 diabetes mellitus: In the subgroup analysis stratified by race, a significant association between KCNQ1 rs2237892 C→T gene polymorphism and T2DM was observed in the Chinese subgroup under the allelic (OR: 1.350; 95% CI: 1.270–1.430; P < 0.00001), recessive (OR: 0.640; 95% CI: 0.560–0.730; P < 0.00001), dominant (OR: 1.424; 95% CI: 1.198–1.692; P < 0.00001), and additive genetic models (OR: 1.344; 95% CI: 1.187–1.522; P < 0.00001).