Table 3.
Multiple logistic regression analysis of combined effects of factors associated with insomnia (MISS ≥ 6) among adolescents aged 15–17 years (n = 1477).
| Independent Variables | Wald | OR | 95% CI for OR | p |
|---|---|---|---|---|
| Male sex | 1.931 | 0.771 | 0.534–1.113 | 0.165 |
| ≥1 failed school course(s) | 4.384 | 1.648 | 0.1674–0.717 | 0.036 |
| Poor family financial situation | 0.442 | 1.156 | 0.755–1.770 | 0.506 |
| School start at 08:15 or earlier | 0.093 | 1.059 | 0.733–1.530 | 0.760 |
| Alcohol and/or cigarette use ≥1 time/month | 3.850 | 2.064 | 1.381–3.084 | <0.0001 |
| Screen time (not school related) <4 h/day a | 1.473 | 0.796 | 0.550–1.151 | 0.225 |
| Physical activity ≥2 times/week and good health (ref. category) | ||||
| Physical activity ≤1 time/week and good self-reported health | 6.342 | 1.752 | 1.132–2.710 | 0.012 |
| Physical activity ≥2 times/week and poor self-reported health b | 68.106 | 11.929 | 6.621–21.493 | <0.0001 |
| Physical activity ≤1 time /week and poor self-reported health b | 85.111 | 18.873 | 10.111–35.227 | <0.0001 |
CI = confidence interval; OR = odds ratio. Hosmer–Lemeshow goodness-of-fit test, p = 0.042; Nagelkerke’s pseudo-R2 = 0.268; there were no signs of multicollinearity (tolerance: 0.7–0.8). a Time spent on social media/gaming/TV/film on schooldays. b Neither good nor bad/quite bad/very bad self-reported health.