Global, regional, and national burdens of common micronutrient deficiencies from 1990 to 2019: A secondary trend analysis based on the Global Burden of Disease 2019 study.

Between 1990 and 2019, the age-standardized prevalence rate due to vitamin A deficiency was highest in low- and low-middle-SDI countries and showed a decreasing trend in all five SDI regions ( Supplementary Figure 2 and Supplementary Table 6 ).

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