GSTP1 and type 2 diabetes mellitus: The GSTP1 polymorphism were also found to be associated with increased risk of T2DM (IIe/Val vs. IIe/IIe: OR = 1.24, 95% CI = 1.02–1.50, Val/Val + IIe/Val vs. IIe/IIe: OR = 1.27, 95% CI = 1.05–1.53 and Val vs. IIe: OR = 1.22, 95% CI = 1.05–1.42, Table 3).