Table 1 Happiness index scale (HIS)
Items | PCA | Score | |||
|---|---|---|---|---|---|
Loading | never | a few days | more than half the days | almost every day | |
Factor 1: Depression trend | |||||
 HIS-1 (PHQ-1): Little interest or pleasure in doing things | 0.879 | 0 | 1 | 2 | 3 |
 HIS-2 (PHQ-2): Feels down, depressed, or hopeless | 0.811 | 0 | 1 | 2 | 3 |
Factor 2: Degree of anxiety | |||||
 HIS-3 (GAD-3): Worries too much about different things | 0.822 | 0 | 1 | 2 | 3 |
 HIS-4 (GAD-6): Becomes easily annoyed or irritable | 0.854 | 0 | 1 | 2 | 3 |
Factor 3: Sleep quality | |||||
 HIS-5 (AIS-4): Total sleep time | 0.913 | 0 | 1 | 2 | 3 |
 HIS-6 (AIS-5): Total sleep quality (no matter how long you sleep | 0.902 | 0 | 1 | 2 | 3 |
| Â | Â | no | yes | ||
Factor 4: Suicidal tendency | Â | Â | Â | ||
 HIS-7 (C-SSRS-2): Do you actually have some thoughts about suicide? | 0.921 | 0 | 1 | ||
 HIS-8 (C-SSRS-3): Have you been thinking about how to kill yourself? | 0.930 | 0 | 3 | ||