Table 2. Univariate and multivariate binary logistic regression analyses of predictors for sleep quality, N = 180.
| Factors | Univariate | Multivariate | ||||
|---|---|---|---|---|---|---|
| p-value | OR | 95% CI | p-value | OR | 95% CI | |
| Gender | ||||||
| Female | ref | ref | ref | ref | ref | ref |
| Male | 0.001* | 4.8 | 1.9–12.5 | 0.001* | 9.4 | 2.5–35.4 |
| PHQ-4 | ||||||
| Normal | ref | ref | ref | ref | ref | ref |
| Mild | 0.8 | 1.1 | 0.5-2.8 | 0.85 | 1.1 | 0.3–4.3 |
| Moderate | 0.03* | 3.8 | 1.1–12.7 | 0.82 | 1.3 | 0.1–18.2 |
| Severe | 0.026* | 10.8 | 1.3–87.7 | 0.44 | 4.9 | 0.1–278.6 |
| PHQ-4 | ||||||
| Anxiety | 0.001* | 5.7 | 2–15.7 | 0.18 | 3.5 | 0.6–22.8 |
| Depression | 0.003* | 4.6 | 1.7–12.6 | 0.98 | 0.98 | 0.1–6.9 |
| SWLS | < 0.001* | 0.8 | 0.8–0.9 | 0.007* | 0.9 | 0.8–0.9 |
| Number of on-calls/month | ||||||
| 0 | ref | ref | ref | ref | ref | ref |
| 1–2 | 0.6 | 1.8 | 0.16–20.9 | 0.16 | 8.4 | 0.4–156.8 |
| 3–4 | 0.2 | 2.3 | 0.6–9.4 | 0.051 | 12.1 | 0.9–148.2 |
| 5–6 | 0.02* | 4.3 | 1.3–14.7 | 0.199 | 3.1 | 0.6–17.2 |
| > 6 | 0.013* | 3.9 | 1.3–11.4 | 0.003* | 10.4 | 2.2–48.7 |
| Residency level | ||||||
| R1 | ref | ref | ref | ref | ref | ref |
| R2 | 0.14 | 2.2 | 0.8–6.4 | 0.49 | 1.7 | 0.4–7.7 |
| R3 | 0.085* | 3.3 | 0.9–12.4 | 0.1 | 4.4 | 0.7–25.6 |
| R4 | 0.042* | 5.0 | 1.0–24.0 | 0.2 | 3.7 | 0.5–28.2 |
| R5 | 0.07 | 0.3 | 0.1–1.1 | 0.07 | 0.2 | 0.02–1.2 |
OR: odds ratio; ref: reference group; PHQ-4: four-item Patient Health Questionnaire for anxiety and depression; SWLS: Satisfaction with Life Scale; R: year of residency. * p < 0.05.