Table 2.
Pearson’s correlation coefficients between sleep quality components (as measured by the PSQI), anxiety, depression, stress (measured by the DASS-21), and physical (SF-12 PCS) and mental (SF-12 MCS) health-related quality of life.
| Variable | Mean (SD) | 1. | 2. | 3. | 4. | 5. | 6. | 7. | 8. | 9. | 10. | 11. | 12. | 13. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. PSQI total | 7.0 (3.3) | 1 | ||||||||||||
| 2. PSQI perceived sleep quality | 1.4 (0.7) | 0.72 *** | 1 | |||||||||||
| 3. PSQI sleep latency | 1.5 (1.1) | 0.75 *** | 0.50 *** | 1 | ||||||||||
| 4. PSQI sleep duration | 0.8 (0.7) | 0.59 *** | 0.41 *** | 0.27 *** | 1 | |||||||||
| 5. PSQI habitual sleep efficiency | 0.6 (0.8) | 0.64 *** | 0.32 *** | 0.41 *** | 0.45 *** | 1 | ||||||||
| 6. PSQI sleep disturbances | 1.2 (0.6) | 0.60 *** | 0.41 *** | 0.39 *** | 0.22 *** | 0.19 *** | 1 | |||||||
| 7. PSQI sleep medication use | 0.3 (0.8) | 0.53 *** | 0.23 *** | 0.26 *** | 0.15 ** | 0.16 ** | 0.22 *** | 1 | ||||||
| 8. PSQI daytime disfunction | 1.1 (0.7) | 0.51 *** | 0.33 *** | 0.20 *** | 0.17 ** | 0.14 ** | 0.35 *** | 0.19 *** | 1 | |||||
| 9. DASS-21 anxiety | 6.8 (4.8) | 0.41 *** | 0.24 *** | 0.24 *** | 0.17 ** | 0.16 ** | 0.48 *** | 0.22 *** | 0.39 *** | 1 | ||||
| 10. DASS-21 depression | 9.1 (5.4) | 0.40 *** | 0.25 *** | 0.27 *** | 0.19 *** | 0.20 *** | 0.36 *** | 0.17 ** | 0.39 *** | 0.60 *** | 1 | |||
| 11. DASS-21 stress | 12.8 (4.7) | 0.42 *** | 0.35 *** | 0.25 *** | 0.19 *** | 0.14 ** | 0.43 *** | 0.19 *** | 0.37 *** | 0.63 *** | 0.66 *** | 1 | ||
| 12. SF-12 PCS | 53.8 (7.2) | −0.29 *** | −0.21 *** | −0.17 *** | −0.10 * | −0.11 * | −0.29 *** | −0.17 ** | −0.28 *** | −0.39 *** | −0.27 *** | −0.22 *** | 1 | |
| 13. SF-12 MCS | 33.6 (10.0) | −0.35 *** | −0.31 *** | −0.19 *** | −0.15 ** | −0.20 *** | −0.28 *** | −0.11 * | −0.35 *** | −0.37 *** | −0.57 *** | −0.54 *** | −0.10 * | 1 |
Note. PSQI: Pittsburgh Sleep Quality Index; DASS-21: 21-item Depression Anxiety Stress Scale; SF-12 PCS: Short Form-12 Physical Component Summary; SF-12 MCS: Short Form-12 Mental Component Summary; * p < 0.05; ** p < 0.01; *** p < 0.001.