TCF7L2 and type 2 diabetes mellitus: The confounding nature of the influence of environmental factors in the manifestation of T2DM is confirmed by the significant association of BMI and WHR as covariates in the Logistic Regression Analysis of T2DM on genetic variants of TCF7L2, albeit a highly significant association was evident for rs7903146 and rs11196205 even after adjusting for the effect of covariates.