FMO5 and type 2 diabetes mellitus: Overall, the NAD(P)H oxidase p22 phox gene C242T polymorphism was significantly associated with T2DM risk in the allelic model (REM: OR = 1.23, 95% CI = 1.06–1.43), additive model (FEM: OR = 1.61, 95% CI = 1.14–2.26), and recessive model (FEM: OR = 1.50, 95% CI = 1.10–2.05), but not in the dominant model (REM: OR = 1.20, 95% CI = 0.99–1.46) (Fig. 2).