Trend and Burden of Vitamin A Deficiency in 1990-2021 and Projection to 2050: A Systematic Analysis for the Global Burden of Disease Study 2021.

Similarly, no significant improvements in VAD-associated disabilities were identified in Sub-Saharan African regions, as the AAPCs calculated for Central, Western, and Eastern Sub-Saharan African regions did not reach statistical significance ( p > 0.05).

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A positive result indicates an increasing trend in disease burden and mortality, and a negative AAPC indicates a decreasing or improving trend in disease burden and mortality.

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