Nutritional improvement status of primary and secondary school students in the pilot nutrition improvement areas of Hainan, China from 2014 to 2021.

For details, see Table 4 . Nutritional status and changing trends of primary and secondary school students by sex from 2014 to 2021 From 2014 to 2021, the prevalence of undernutrition for both boys and girls showed a decreasing trend (both P < 0.05), decreasing by 8.94% and 5.85%, respectively.

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For details, see Table 1 . Primary and secondary school student’s height and weight status and change trend from 2014 to 2021 From 2014 to 2021, the average height of both boys and girls in Qiongzhong County showed an increasing trend.

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