*2.2. Anthropometric Measurements*

In line with previous studies on Austrian adolescents [16,17], students' height and weight were measured in sport clothing and barefoot during regular physical education lessons in the school gym. Body height was measured with a mobile stadiometer "Seca 217" (Seca, Hamburg, Germany) with an accuracy of 0.1 cm, and body weight was measured with a calibrated scale "Grundig PS 2010" (Grundig AG, Neu-Isenburg, Germany) with an accuracy of 0.1 kg. BMI (kg/m<sup>2</sup> ) was calculated, and students were classified according to the BMI reference system by Kromeyer-Hauschild et al. [18] into three groups: underweight vs. normal weight vs. overweight/obese.
