AIP and prediabetes syndrome: When AIP was considered as a categorical variable, in the fully adjusted Model 3, compared to the lowest quartile of AIP (Q1 group), the adjusted ORs for prediabetes in the Q2, Q3, and Q4 groups were 1.07 (95% CI: 0.95–1.20), 1.25 (95% CI: 1.11–1.41), and 1.52 (95% CI: 1.33–1.74), respectively.