Table 4 Evaluation of internal consistency and test-retest reliability of the factors of the Thai BQ
From: Preliminary validity and reliability of a Thai Berlin questionnaire in stroke patients
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) |