Table 1 Factor structure of six models assessed by Confirmatory Factor Analysis (CFA).
From: Structural validity of the Pittsburgh Sleep Quality Index among medical students in Iran
Component | Model A | Model B | Model C | Model D | Model E | Model F |
|---|---|---|---|---|---|---|
1. Subjective sleep quality | 1 | 1 | 1 | 1 | 1 | 1 |
2. Sleep latency | 1 | 1 | 1 | 1 | 2 | 2 |
3. Sleep duration | 1 | 2 | 2 | 2 | 3 | 3 |
4. Habitual sleep efficiency | 1 | 2 | 2 | 2 | 3 | 3 |
5. Sleep disturbances | 1 | 1 | 3 | 3 | 2 | 1 |
6. Use of sleep medication | 1 | 1 | 1 | 3 | 2 | 2 |
7. Daytime dysfunction | 1 | 1 | 3 | 3 | 1 | 1 |
