The genotype distribution of rs10811661 (CDKN2A/2B) contrasted between the GDM and non-GDM groups but with no significant changes in co-dominant, dominant, recessive and over-dominant models, with P values of 0.510, 0.665, 0.452, 0.715 and 0.538 respectively, and OR values of 0.700 (95% CI: 0.241–2.031), 0.667 (95% CI: 0.105–4.218), 0.692 (95% CI: 0.265–1.811), 0.711 (95% CI: 0.114–4.454) and 0.718 (95% CI: 0.249–2.070), respectively (Table 3). The gene discussed is CDKN2A; the disease is gestational diabetes.