HIF1A and diabetes mellitus: The pooled analysis indicated no significant association of HIF1A Ala588Thr polymorphism with diabetes risk under all genetic models, including the allelic (OR = 1.26, 95% CI = 0.98-1.61; P = 0.07), homozygous (OR = 1.49, 95% CI = 0.89-2.48; P = 0.128), heterozygous (OR = 2.25, 95% CI = 0.55-9.16; P = 0.259), dominant (OR = 1.65, 95% CI = 0.73-3.75; P = 0.229) and recessive (OR = 0.79, 95% CI = 0.50-1.24; P = 0.297) genetic models.