By logistic regression, the strongest prediction model for development of T2DM included fasting glucose at GDM diagnosis (P = 0.001, Exp(B) = 1.92), gestational age at diagnosis (P = 0.004, Exp(B) = 0.99), and insulin treatment (P = 0.03 Exp(B) = 2.5). Here, INS is linked to type 2 diabetes mellitus.