MTNR1B and gestational diabetes: Subsequent calculation at the most significant pre-pregnancy BMI threshold using a contingency table and χ2 test resulted in the following OR and p values, respectively: Carrying the G risk allele of the MTNR1B rs10830963 was associated with a significantly higher odds of AIT initiation in patients with GDM and pre-pregnancy BMI ≥ 29 kg/m2 (OR = 5.2, p = 0.02 [χ2 test], statistical power = 0.53, Table 3).