Table 1. General characteristics of the adolescents ( n  = 1,150) in the present study.

Variable	Values
Age (in years): mean ± standard deviation	16.6 ± 1.2
Weight (in kg): mean ± standard deviation	63.7 ± 12.6
Height (in cm): mean ± standard deviation	171.6 ± 7.1
Waist circumference (in cm): mean ± standard deviation	76.6 ± 9.4
Ethnicity: non-white (%)	72.0
Class shift: evening (%)	26.2
Place of residence: urban (%)	79.2
Abdominal obesity (%)	15.4
Low physical activity level (%)	64.4
Poor sleep quality (%)	21.7
Hours slept on weekdays (%)
≤ 6 per day	27.0
7 to 8 per day	46.7
≥ 9 per day	26.3
Hours slept on weekends (%)
≤ 6 per day	20.5
7 to 8 per day	35.3
≥ 9 per day	44.2