Table 2.
Characteristics according to physical activity status in 73,238 Korean adolescents
| Inactive | Active | |||
|---|---|---|---|---|
| (N = 47549) | (N = 25689) | X 2/t | p | |
| Sex, N (%) | 5179.97 | <0.001 | ||
| Male | 20283 (42.7) | 18108 (70.5) | ||
| Female | 27266 (57.3) | 7581 (29.5) | ||
| Residential area, N (%) | 20.61 | <0.001 | ||
| Rural | 5712 (12.0) | 3344 (13.0) | ||
| Small city | 17125 (36.0) | 8941 (34.8) | ||
| Large city | 24712 (52.0) | 13404 (52.2) | ||
| Age (years), Mean (SD) | 15.31 (1.74) | 14.60 (1.67) | 53.68 | <0.001 |
| Perceived academic performance, N (%) | 101.06 | <0.001 | ||
| Very high | 5015 (10.5) | 3344(13.0) | ||
| High-middle-low | 36705 (77.2) | 19242(74.9) | ||
| Very low | 5829 (12.3) | 3103(12.1) | ||
| Socio-economic status, N (%) | 704.97 | <0.001 | ||
| Very high | 2448 (5.1) | 2330 (9.1) | ||
| High | 9850 (20.7) | 6444 (25.1) | ||
| Middle | 23044 (48.5) | 11209 (43.6) | ||
| Low | 9179 (19.3) | 4211 (16.4) | ||
| Very low | 3028 (6.4) | 1495 (5.8) | ||
| Father’s education level, N (%) | 31.41 | <0.001 | ||
| Complete middle school or less | 2918 (7.4) | 1485 (7.1) | ||
| Complete high school | 17273 (44.0) | 8727 (41.9) | ||
| Complete college or more | 19079 (48.6) | 10622 (51.0) | ||
| Mother’s education level, N (%) | 129.43 | <0.001 | ||
| Complete middle school or less | 2922 (7.4) | 1390 (6.7) | ||
| Complete high school | 22755 (57.8) | 11132 (53.8) | ||
| Complete college or more | 13686 (34.8) | 8161(39.5) | ||
| Body mass index, Mean (SD) | 20.44 (2.93) | 20.56 (3.08) | −5.23 | <0.001 |
| Sleep satisfaction (1–5) | 2.78 (1.10) | 2.95 (1.13) | −19.20 | <0.001 |
| Perceived stress (1–5) | 3.45 (0.92) | 3.28 (0.99) | 22.96 | <0.001 |
| KSscale scores (20–80) | 30.20 (9.40) | 29.74 (9.69) | 6.18 | <0.001 |
KSscale, Internet Addiction Proneness Scale for Youth–Short Form.