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Evaluation of internal consistency and test-retest reliability of the factors of the Thai BQ
| Factors | Number of questions | Cronbach’s alpha (95% CI) | Kappa (95% CI) |
|---|---|---|---|
| 1. Snoring behaviour |
5 |
0.89 (0.85-0.92) |
0.88 (0.79-0.97) |
| 2. Sleepiness during driving |
2 |
0.78 (0.68-0.86) |
0.81 (0.60-1.00) |
| 3. Daytime fatigue |
2 |
0.42 (0.31-0.61) |
0.66 (0.43-0.89) |
| 4. Hypertension or obesity |
2 |
- |
0.98 (0.94-1.00) |
| Total questionnaire | 11 | 0.77 (0.69-0.83) | 0.86 (0.74-0.98) |
