HNF1A and type 2 diabetes mellitus: In the HNF1A-MODY group it reached −2.4 ± 19.0 (p = 0.22), whereas, for the “below median” comparisons, the differences ranged from −1.5 mL/min/1.73 m2 in T2DM up to −22.1 mL/min/1.73 m2 in the controls.