Table 2.

Variation of NREM Event Duration by Demographics and Comorbidities (N = 1,998)

	NREM Hypopnea Duration			NREM Obstructive Apnea Duration
Characteristic	Mean ± SD	Spearman's ρ	P Value	Mean ± SD	Spearman's ρ	P Value
Age, yr		0.16	<0.001		0.20	<0.001
<65	20.8 ± 4.9			22.2 ± 6.4
≥65	22.3 ± 5.9			24.8 ± 7.8
BMI, kg/m2		−0.33	<0.001		−0.23	<0.001
<30	22.8 ± 5.8			24.8 ± 7.8
≥30	20.0 ± 4.7			22.3 ± 6.5
Sex		—	<0.001		—	<0.001
M	23.2 ± 5.9			25.4 ± 7.4
F	20.3 ± 4.9			22.1 ± 7.1
Race/ethnicity		—	<0.001		—	<0.001
Non-Hispanic white	21.9 ± 5.5			23.8 ± 7.7
Asian	24.3 ± 6.2			27.1 ± 8.5
Black	20.4 ± 5.4			22.3 ± 6.4
Hispanic	21.7 ± 5.2			23.9 ± 7.0
Smoking status		—	<0.001		—	0.084
Current	19.6 ± 4.7			24.0 ± 0.6
Former	21.6 ± 5.7			23.9 ± 7.3
Never	22.1 ± 5.5			22.0 ± 6.1
Comorbidities
Hypertension		—	0.232		—	0.887
Presence	21.6 ± 5.7			23.9 ± 7.7
Absence	21.9 ± 5.4			23.8 ± 7.0
Impaired fasting glucose or diabetes		—	0.329		—	0.461
Presence	21.6 ± 5.3			24.0 ± 7.3
Absence	21.8 ± 5.8			23.7 ± 7.6
Heart failure		—	0.879		—	0.580
Presence	21.6 ± 5.4			24.5 ± 7.5
Absence	21.7 ± 5.6			23.8 ± 7.4
COPD		—	0.026		—	0.003
Presence	19.3 ± 4.2			20.3 ± 4.2
Absence	21.8 ± 5.6			23.9 ± 7.5
Sedative use		—	0.211		—	0.143
Presence	21.3 ± 5.3			23.1 ± 6.9
Absence	21.8 ± 5.6			24.0 ± 7.5

Definition of abbreviations: BMI = body mass index; COPD = chronic obstructive pulmonary disease; NREM = non-REM.