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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)