INS and Insulin resistance: In all three datasets, the 2‐h glucose concentration, the area under the curve in OGTT, and the HbA1c concentration showed a stronger correlation to SPINA‐DI than to other calculated parameters including SPINA‐GBeta, SPINA‐GR, homeostatic model assessment of β‐cell function (HOMA‐Beta), homeostatic model assessment of insulin resistance (HOMA‐IR), and quantitative insulin sensitivity check index.