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PSQI, Pittsburgh Sleep Quality Index; PHQ-9, Patient Health Questionnaire-9
| Variables | 1 | 2 | 3 | 4 | 5 | 6 |
| PSQI score | 1 | - | - | - | - | - |
| PHQ-9 score | 0.65 | 1 | - | - | - | - |
| Age | -0.22 | -0.28 | 1 | - | - | - |
| Sleep latency | 0.58 | 0.45 | -0.18 | 1 | - | - |
| Sleep duration | -0.52 | -0.38 | 0.15 | -0.42 | 1 | - |
| Sleep efficiency | -0.48 | -0.35 | 0.12 | -0.38 | 0.56 | 1 |
