Fig. 4. Linear regression model showing the difference in BMI z-score during the pre-COVID -19 period and COVID-19 period. After 47 days of school closure, a positive increase in BMI z-scores of the cases is observed. Each circle represents the difference in BMI z-score (COVID-19 period BMI z-score – pre-COVID-19 period BMI z-score) in each case included. Circles located in the grey area of the graph show weight loss in the COVID-19 period compared to the pre-COVID-19 period, whereas circles in the white area show weight gain.

BMI = body mass index, COVID-19 = coronavirus disease 2019.