When MPO was divided into quartiles, Supplementary Table 6 showed that compared with Q1 (<18.35 ng/ml), the adjusted odds ratio (OR) for vitamin D deficiency and insufficiency (25(OH)D < 50 nmol/L) in Q2-Q4 were 1.48 (95% CI, 1.26–1.73), 1.78 (95% CI, 1.52–2.09), and 1.77 (95% CI, 1.51–2.08), respectively, with P for the trend < 0.0001. The gene discussed is MPO; the disease is vitamin D deficiency.