Ren Y, et al. - Authors sought to determine the optimal waist circumference (WC) cutoffs for predicting type 2 diabetes mellitus (T2DM) among rural Chinese people. For this analysis, a cohort of eleven thousand, nine hundred sixty-eight participants (732 new-onset T2DM) from a rural area in China with age 18 to 87 years was established at baseline during July to August of 2007 and 2008 and followed up during July to August of 2013 and 2014. It was observed in the findings that the optimal WC cutoffs for predicting T2DM were similar between males and females. For predicting T2DM, the criteria of WC for central obesity were no longer practical.