Table 2.
Factor structure and loadings on the simplified Japanese version of the Athens Insomnia Scale (AIS‐SJ) (confirmatory factor analysis, n = 50 547)
| Item | F1: Nocturnal | F2: Daytime |
|---|---|---|
| 1. Sleep induction | 0.74 | |
| 2. Awakening during the night | 0.73 | |
| 3. Awakening in the early morning | 0.71 | |
| 4. Sleep duration | 0.80 | |
| 5. Sleep quality | 0.87 | |
| 6. Well‐being during the day | 0.91 | |
| 7. Functioning during the day | 0.91 | |
| 8. Sleepiness during the day | 0.62 |
Inter‐factor correlation was 0.77. Model fit: root mean square error of approximation = 0.06; comparative fit index = 0.98.