GSTM1 and diabetes mellitus: The recursive algorithm further premeditated the diabetes threshold inflection point to be log2-HbEO = 8.03 (pmol/g Hb), with an OR and 95% CI of 1.11 (1.01–1.19) on the left side of the point as well as 2.10 (1.08–4.06) on the right side, which were both statistically significant (p < 0.05).