CYP19A1 and type 2 diabetes mellitus: Meanwhile, significant associations were found between CYP19A1 rs3751599 and the decreased risk of retinopathy in T2DM patients under the allelic (OR = 0.53, 95% CI = 0.29–0.99, P = 0.044), dominant (OR = 0.51, 95% CI = 0.26–0.98, P = 0.045) and additive (OR = 0.50, 95% CI = 0.26–0.95, P = 0.034) models.