INS and type 2 diabetes mellitus: The preoperative insulinogenic index and disposition index, which represent insulin secretory function, were significantly higher in the T2DM remission group (0.28 ± 0.30 vs. 0.10 ± 0.12; p = 0.015, 0.81 ± 0.78 vs. 0.46 ± 0.39; p = 0.077).