Table 2.
Adjusted association factors associated with physical activity and stress (2015–2017).
| Variables | Boys | Girls | ||
|---|---|---|---|---|
| Adjusted OR | 95% CI | Adjusted OR | 95% CI | |
| Number of days of intense physical activity per week * | ||||
| More than 5 days a week | 0.79 | (0.78–0.80) | 0.77 | (0.75–0.79) |
| 4 days a week | 0.87 | (0.85–0.88) | 0.84 | (0.82–0.87) |
| 3 days a week | 0.89 | (0.88–0.91) | 0.84 | (0.82–0.85) |
| 2 days a week | 0.99 | (0.98–1.01) | 0.90 | (0.89–0.92) |
| 1 days a week | 1.03 | (1.02–1.05) | 0.95 | (0.93–0.96) |
| Non-physical activity | 1.00 | 1.00 | ||
| Age | ||||
| 14 (middle school 1) | 1.00 | 1.00 | ||
| 15 (middle school 2) | 1.13 | (1.12–1.15) | 1.13 | (1.11–1.15) |
| 16 (middle school 3) | 1.15 | (1.14–1.17) | 1.10 | (1.08–1.11) |
| 17 (high school 1) | 1.17 | (1.15–1.18) | 1.32 | (1.30–1.34) |
| 18 (high school 2) | 1.31 | (1.29–1.33) | 1.58 | (1.55–1.60) |
| 19 (high school 3) | 1.22 | (1.21–1.24) | 1.60 | (1.57–1.63) |
| Household income | ||||
| High | 1.00 | 1.00 | ||
| Medium-high | 1.37 | (1.36–1.39) | 1.46 | (1.43–1.49) |
| Medium | 1.53 | (1.51–1.55) | 1.78 | (1.75–1.81) |
| Medium-low | 2.16 | (2.13–2.20) | 2.23 | (2.18–2.28) |
| Low | 1.86 | (1.81–1.91) | 1.99 | (1.91–2.08) |
| Residence type | ||||
| Live with family | 1.00 | 1.00 | ||
| Live with relative | 0.73 | (0.70–0.76) | 0.90 | (0.84–0.96) |
| Accommodation, trace, dormitory | 1.00 | (0.98–1.03) | 1.04 | (1.00–1.08) |
| Childcare facility | 0.42 | (0.40–0.44) | 0.39 | (0.36–0.42) |
| Number of days of weight training per week | ||||
| More than 5 days a week | 1.00 | 1.00 | ||
| 4 days a week | 1.04 | (1.02–1.06) | 1.04 | (1.00–1.09) |
| 3 days a week | 1.05 | (1.03–1.06) | 1.10 | (1.07–1.14) |
| 2 days a week | 1.12 | (1.11–1.14) | 1.07 | (1.03–1.10) |
| 1 days a week | 1.12 | (1.11–1.14) | 1.11 | (1.08–1.14) |
| Non-physical activity | 1.20 | (1.18–1.21) | 1.25 | (1.22–1.29) |
| Time spent sitting and studying on a weekday (hours) | ||||
| <8 | 1.00 | 1.00 | ||
| 8 ≤ n < 12 | 1.04 | (1.03–1.05) | 1.04 | (1.02–1.05) |
| 12 ≤ n < 16 | 1.22 | (1.21–1.24) | 1.15 | (1.13–1.16) |
| 16 ≤ n < 20 | 1.38 | (1.36–1.39) | 1.38 | (1.36–1.41) |
| Grade | ||||
| High | 1.00 | 1.00 | ||
| Medium-high | 1.14 | (1.13–1.16) | 1.21 | (1.19–1.23) |
| Medium | 1.11 | (1.10–1.13) | 1.29 | (1.26–1.31) |
| Medium-low | 1.24 | (1.22–1.26) | 1.44 | (1.42–1.47) |
| Low | 1.33 | (1.30–1.35) | 1.53 | (1.50–1.57) |
| Alcohol consumption | ||||
| Yes | 1.17 | (1.16–1.18) | 1.14 | (1.12–1.15) |
| No | 1.00 | 1.00 | ||
| Smoking | ||||
| Yes | 1.03 | (1.02–1.04) | 0.94 | (0.91–0.96) |
| No | 1.00 | 1.00 | ||
| Depression | ||||
| Yes | 3.70 | (3.65–3.75) | 4.29 | (4.21–4.36) |
| No | 1.00 | 1.00 | ||
| Suicidal ideation | ||||
| Yes | 2.74 | (2.68–2.80) | 3.20 | (3.11–3.29) |
| No | 1.00 | 1.00 | ||
* p-value for trend; boys (p < 0.0001), girls (p < 0.0001). CI: confidence interval; OR: odds ratio.