Changes in Adolescent Health Behavior and the Exacerbation of Economic Hardship During the COVID-19 Pandemic: A Cross-sectional Study From the Korea Youth Risk Behavior Survey.

However, there was an increasing trend in the proportion of middle and high school students who had not eaten breakfast for >4 days in the past 7 days: 27.9% in 2015, 35.7% in 2019, 37.3% in 2020, and 38.0% in 2021 [ 11 ].

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