The aim of this study was to employ this modified version (M-QUICKI), the original one, and the “Homeostasis Model Assessment of Insulin Resistance” (HOMA-IR) to separate selected non-diabetic adults into high- (HIR) and low-insulin-resistant (LIR) subgroups, using earlier reported cut-off points, in order to investigate whether this division produces similar results and whether it leads to a difference in well-known anthropometric and biochemical characteristics between LIR and HIR subgroups. Here, INS is linked to Insulin resistance.