Table 1Sociodemographic characteristics of the sample (N = 74,186)—2012 Korea Youth Risk Behavior Web-based Survey.
|
Total (N = 74,186) |
Boys (n = 38,221) |
Girls (n = 35,965) |
Age (y), mean ± SD |
14.94 (1.75) |
14.96 (1.75) |
14.92 (1.74) |
BMI (kg/m2), mean ± SD∗
|
20.60 (3.02) |
20.90 (3.28) |
20.26 (7.93) |
Nonoverweight (0–85%) |
89.0 |
85.4 |
92.6 |
Overweight (≥ 85%) |
11.0 |
14.6 |
7.4 |
Family economic status (%) |
Low |
30.7 |
33.4 |
27.7 |
Middle |
46.7 |
44.6 |
49.0 |
High |
22.6 |
22.0 |
23.3 |
Pubertal timing (%)†
|
1 |
19.4 |
15.4 |
23.8 |
2 (average) |
23.3 |
14.8 |
32.6 |
3 |
25.7 |
18.1 |
34.1 |
4 |
31.6 |
51.7 |
9.5 |
Physical activity (%) |
Moderate-to-vigorous physical activity ≥ 60 min/d |
None |
36.9 |
27.9 |
46.8 |
1–2 times/wk |
32.6 |
31.7 |
33.5 |
3–4 times/wk |
18.5 |
23.1 |
13.5 |
≥ 5 times/wk |
12.0 |
17.3 |
6.1 |
Muscular strengthening exercises |
None |
51.7 |
37.1 |
67.8 |
1–2 times/wk |
29.1 |
34.7 |
23.0 |
3–4 times/wk |
11.4 |
16.3 |
6.0 |
≥ 5 times/wk |
7.8 |
11.9 |
3.2 |
Sedentary behavior (%) |
Weekdays |
> 2 h |
52.1 |
54.6 |
49.3 |
2–3 h |
23.0 |
23.3 |
22.7 |
3–4 h |
11.0 |
10.2 |
12.0 |
≥ 4 h |
13.9 |
11.9 |
16.0 |
Weekends |
> 2 h |
29.9 |
32.3 |
27.2 |
2–3 h |
24.7 |
25.8 |
23.5 |
3–4 h |
18.0 |
17.1 |
18.9 |
≥ 4 h |
27.5 |
24.8 |
30.4 |
Table 2Associations (OR and 95% CI) between relative pubertal timing, physical activity, and sedentary behavior after controlling for BMI∗ among Korean adolescent boys (N = 38,221)—2012 Korea Youth Risk Behavior Web-based Survey.
|
|
1†
|
2 (average)†
|
3†
|
4†
|
OR (95% CI) |
OR (95% CI) |
OR (95% CI) |
OR (95% CI) |
Moderate-to-vigorous physical activity ≤ 60 min/d |
≥ 5 times/wk |
1.04 (1.02–1.05) |
1 |
0.99 (0.97–1.00) |
0.95 (0.94–0.96) |
Muscular strengthening exercise |
≥ 3 times/wk |
1.06 (1.05–1.07) |
1 |
0.91 (0.90–0.92) |
0.85 (0.84–0.86) |
Sedentary behavior (weekdays) |
< 2 h/d |
0.94 (0.93–0.95) |
1 |
1.10 (1.09–1.11) |
1.01 (1.00–1.02) |
Sedentary behavior (weekends) |
< 2 h/d |
1.02 (1.01–1.04) |
1 |
0.99 (0.98–1.00) |
1.06 (1.05–1.07) |
Table 3Associations (OR and 95% CI) between relative pubertal timing, physical activity, and sedentary behavior after controlling for BMI ∗ among Korean adolescent girls (N = 35,965)—2012 Korea Youth Risk Behavior Web-based Survey.
|
|
1 †
|
2 (average) †
|
3 †
|
4 †
|
OR (95% CI) |
OR (95% CI) |
OR (95% CI) |
OR (95% CI) |
Moderate-to-vigorous physical activity ≤ 60 min/d |
≥ 5 times/wk |
1.05 (1.04–1.07) |
1 |
1.07 (1.06–1.09) |
1.29 (1.26–1.32) |
Muscular strengthening exercise |
≥ 3 times/wk |
1.13 (1.11–1.15) |
1 |
1.12 (1.11–1.14) |
1.26 (1.24–1.28) |
Sedentary behavior (weekdays) |
< 2 h/d |
1.00 (0.99–1.01) |
1 |
1.04 (1.03–1.05) |
1.28 (1.16–1.29) |
Sedentary behavior (weekends) |
< 2 h/d |
1.04 (1.03–1.05) |
1 |
1.01 (1.00–1.02) |
1.34 (1.32–1.36) |