Table 6. Logistic regression analysis on the association between patients suffering from OSAS and several independent variables.

	odds ratio (OR)	95% CI for odds ratio (OR)
		Lower Bound	Upper Bound	P value
Subject's age	1.012	0.952	1.076	0.694
BMI	0.907	0.803	1.024	0.116
Neck circumference	1.256	1.066	1.479	0.006*
ESS	0.974	0.887	1.069	0.578
Performance ability	1.363	0.992	1.873	0.056
Interference with daily tasks	1.014	0.705	1.460	0.939
Daytime sleepiness §	1.048	0.762	1.441	0.772
Snoring frequency §	1.589	1.195	2.113	0.001*
Frequent awakenings §	1.027	0.767	1.374	0.860
Difficulty falling asleep §	0.832	0.590	1.173	0.293
Observed awakenings §	0.849	0.362	1.989	0.706
Observed choking §	1.129	0.429	2.965	0.806

Number of sleep study tested subjects = 234.

^§5-point frequency scale.

BMI = Body mass index; ESS = Epworth Sleepiness Scale; AHI = Apnea Hypopnea Index; CVS = cardiovascular disease.