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. 2021 May 11;13(5):1596. doi: 10.3390/nu13051596

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The flow chart of the sampling procedure within the Diet and Activity of Youth during COVID-19 (DAY-19) Study. * data of the Central Statistical Office (CSO) [37,38]; ** data of the Polish Ministry of National Education [39]; *** calculated based on CSO data.