Table 5.
Hierarchical multiple regression model with mental health-related quality of life (SF-12 MCS) as the dependent variable.
| Step 1 | Step 2 | |||||
|---|---|---|---|---|---|---|
| Coefficient (SE) | t | Beta | Coefficient (SE) | t | Beta | |
| Variables | ||||||
| Step 1 | ||||||
| Gender | −0.86 (0.66) | −1.3 | −0.03 | −0.99 (0.65) | −1.53 | −0.03 |
| Age | −0.07 (0.09) | −0.82 | −0.02 | −0.08 (0.09) | −0.87 | −0.02 |
| Smoking habit | 0.17 (0.43) | 0.4 | 0.01 | 0.39 (0.43) | 0.9 | 0.02 |
| Physical exercise | 0.55 (0.44) | 1.25 | 0.03 | 0.55 (0.44) | 1.25 | 0.03 |
| BMI (Kg/m2) | 0.04 (0.06) | 0.65 | 0.01 | 0.05 (0.06) | 0.86 | 0.02 |
| PSS-10 | −1.03 (0.03) | −29.91 *** | −0.65 | −0.93 (0.04) | −24.71 *** | −0.59 |
| Step 2 | ||||||
| Sleep efficiency | 0.04 (0.18) | 0.24 | 0.01 | |||
| Perceived sleep quality | −0.26 (0.14) | −1.86 | −0.05 | |||
| Daily disturbances | −1.2 (0.25) | −4.92 *** | −0.12 | |||
| Summary statistics | ||||||
| Model F | 156.4 *** | 111.46 *** | ||||
| R2 | 0.43 | 0.44 | ||||
| Adjusted R2 | 0.42 | 0.44 | ||||
| R2 change F | 156.4 *** | 12.82 *** | ||||
BMI: Body Mass Index; PSQI: Pittsburgh Sleep Quality Index; PSS-10: 10-item Perceived Stress Scale; PCS: Short Form–12 Physical Component Summary; and MCS: Short Form–12 Mental Component Summary. Beta: standardized regression coefficient. *** p < 0.001.