Table 3 Factor structure of the Thai BQ
From: Preliminary validity and reliability of a Thai Berlin questionnaire in stroke patients
Items | Factor loading | Eigenvalue | % Variance |
|---|---|---|---|
Factor 1: Snoring behaviour | 3.90 | 35.44 | |
Do you snore? | 0.93 | ||
Your snoring is? | 0.74 | ||
How often do you snore? | 0.79 | ||
Has your snoring ever bothered other people? | 0.93 | ||
Has anyone noticed that you quit breathing during your sleep? If yes, how frequently? | 0.95 | ||
Factor 2: Sleepiness during driving | 2.03 | 18.49 | |
Have you ever nodded off or fallen asleep while driving a vehicle? | 0.98 | ||
How often does this occur? | 0.98 | ||
Factor 3: Daytime fatigue | 1.40 | 12.69 | |
How often do you feel tired or fatigued after your sleep? | 0.75 | ||
During your waking time, do you feel tired, fatigue or not up to par? | 0.79 | ||
Factor 4: Hypertension or obesity | 1.05 | 9.54 | |
Do you have high blood pressure? | 0.70 | ||
Do you have BMI ≥ 30 kg/m2? | 0.31 |