Table 1.

Sample characteristics of adolescents (aged 12–17 years)—Korea Youth Risk Behavior web-based Surveys, 2013–2018 (n = 372,433).

Characteristics	Overall	Girls	Boys
Sex	–	47.9	52.1
Age (year)	14.83 ±1.59	14.82 ± 1.60	14.83 ± 1.59
Height (cm)	165.07 ± 8.50	159.95 ± 5.39	169.79 ± 8.10
Weight (kg)	57.30 ± 11.80	52.62 ± 8.30	61.62 ± 12.85
Body mass index (kg/m2)	20.91 ± 3.25	20.53 ± 2.81	21.26 ± 3.58
Age
12 years	8.3	8.4	8.2
13 years	16.8	16.7	16.8
14 years	17.5	17.5	17.7
15 years	18.4	18.5	18.4
16 years	19.2	19.2	19.2
17 years	19.8	19.7	19.7
Family economic status
Low	16.1	16.4	15.7
Middle	46.8	49.5	44.4
High	37.1	34.1	39.9
Father's education level
<Post-secondary graduate	37.0	37.8	36.4
≥Post-secondary graduate	63.0	62.2	63.6
Mother's education level
<Post-secondary graduate	45.1	47.0	43.3
≥Post-secondary graduate	54.9	53.0	56.7
Academic performance
Low	34.0	33.9	34.2
Middle	28.2	29.2	27.3
High	37.8	36.9	38.5

Note: Data are presented as mean ± SD or percentage.