PPARG and Impaired glucose tolerance: The TT genotype of rs3856806 in PPARγ was associated with increased risk of impaired glucose tolerance (T allele: OR: 1.46, 95%CI: 1.055–2.017, P = 0.022; TT: OR: 1.58, 95%CI: 1.104–2.761, P = 0.032).