TCF7L2 and metabolic syndrome: In the current study statistical power for detection of risk of MetS among TT genotypes of the TCF7L2 rs7903146 and rs12255372 variants in total population (0.145–0.464) as well as based on weight changes (0.143–0.756) during follow-up was low; suggesting that due to low power, it is not possible to get a definitive result.