Table 5.

Cognitive Domains

Cognitive Domain	Overlap Syndrome(n = 12)	COPD Only(n = 47)	OSA Only(n = 9)	Former Smoker Controls(n = 21)	One-WayANOVA P Value	Correlation with Carotid β-Stiffness Index
Memory	48.6 ± 2.1	47.9 ± 1.2	50.2 ± 3.1	50.2 ± 2.0	0.72	r = −0.10, P = 0.35
Language	51.4 ± 1.9	51.0 ± 0.9	54.8 ± 2.6	53.9 ± 7.6	0.26	r = −0.11, P = 0.30
Visuospatial	53.3 ± 1.5	52.2 ± 0.8	53.7 ± 2.2	52.4 ± 0.6	0.79	r = 0.05, P = 0.64
Executive Function-Processing Speed	44.9 ± 1.4	49.2 ± 0.74	51.8 ± 2.0	50.2 ± 1.2	0.001*	r = 0.30, P = 0.004*

Data are means ± SE COPD, chronic obstructive pulmonary disease; OSA, obstructive sleep apnea; ANOVA, one-way analysis of variance (ANOVA). n = number of subjects. *P < 0.05.