AIP and vitamin D deficiency: Logistic regression showed that vitamin D insufficiency compared with the sufficient group significantly increased the risk of elevated AIP, AC, non-HDL-C, and CRI-I values with an OR (95% CI) of 3.637 (2.149–6.158), p < 0.0001; 3.589 (1.673–7.700), p = 0.001; 2.074 (1.215–3.540), p = 0.007; and 2.481 (1.481–4.123), respectively, after adjustment for BMI.