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43±1.55 vs. 8.22±2.22, P=0.0104; vitamin D 23.08±11.0 vs. 32.07±19.2, P=0.0007) than that in the nsMPP group; both sMPP and nsMPP did not show a deficiency of vitamins E and D. Logistic regression analysis revealed that vitamin A deficiency was significantly (OR 0.001, 95% CI 0.001-0.334, P=0.009) associated with sMPP, and vitamin A supplementation could reduce the incidence of sMPP. In ≥6 y sMPP, the incidence of vitamin A deficiency was 62.5%, while less then 6 y, 85%, showing a significant difference. Vitamin A level in less then 6 y