KCNQ1 and type 2 diabetes mellitus: A significant association was also found between KCNQ1 rs2237892 C→T gene polymorphism and T2DM in the Korean subgroup under the allelic (OR: 1.300; 95% CI: 1.100–1.520; P = 0.002), recessive (OR: 0.680; 95% CI: 0.490–0.950; P = 0.02), dominant (OR: 1.410; 95% CI: 1.124–1.768; P = 0.003), and additive genetic models (OR: 1.296; 95% CI: 1.102–1.524; P = 0.002).