Table 2.

Correlation between sleep structure and neurocognitive tests among obstructive sleep apnea group [adjusting for age, education, body mass index (BMI), smoking years, and alcohol years].

n = 32		TST (min)	Sleep efficiency (%)	LS/TST (%)	REM/TST (%)
TMT-A	r =	0.010	−0.017	−0.228	0.413
	p =	0.959	0.931	0.253	0.032*
HVLT-R	r =	−0.118	−0.122	−0.410	0.228
	p =	0.557	0.544	0.033*	0.252
Category fluency	r =	−0.489	−0.501	0.164	0.138
	p =	0.010*	0.008**	0.415	0.492

The data were obtained by partial correlation analysis by adjusting the confounding factors of age, education, BMI, smoking index and drinking index; TST, total sleep time; REM, rapid eye movement; LS, light sleep; TMT-A, Trail Making Test: part A; HVLT-R, Hopkins Verbal Learning Test—Revised.

^*p < 0.05;

^**p < 0.01.