Table 2.

Binary logistic-regression analysis of predictors of severe obstructive sleep apnea/hypopnea syndrome by expression of CRY1 and PER3.

Independent Factor	Odds Ratio (95% CI)	p Value
CRY1	2.963 (1.277–6.879)	0.011
PER3	3.746 (1.595–8.795)	0.002
None	Reference a
CRY1 or PER3	2.363 (0.948–5.888)	0.065
CRY1 and PER3	5.800 (1.978–17.004)	0.001

^a The reference for the odds ratio is the absence of the corresponding risk factor. CI, confidence interval.