Table 1. Subjects’ Characteristics and Prevalence of SA (n = 38638) ^{a, b, c}.

	Number	Results	95% CI	P Value
Gender				< 0.0001
Male	18186	466 (4.01)	3.49-4.52
Female	20452	357 (2.61)	2.23-2.99
Age group, y				< 0.0001
18-25	18899	142 (0.86)	0.67-1.06
26-64	17272	563 (3.50)	3.12-3.89
≥ 65	2467	118 (4.47)	3.43-5.46
Race				< 0.0001
White	24430	606 (3.91)	3.49-4.34
AA	4934	104 (3.20)	2.32-4.08
Hispanic	5981	69 (1.33)	0.92-1.75
Other	3293	44 (1.37)	0.42-2.33
Marital status
Married	13627	432 (3.72)	3.24-4.19	< 0.0001
Widowed/divorced/separated	4609	187 (4.42)	3.56-5.28
Never been married	20402	204 (1.53)	1.21-1.86
Income				0.0977
0-19,999	10201	194 (3.05)	2.41-3.70
20,000-49,999	13374	247 (2.81)	2.32-3.30
50,000-74,999	5824	144 (3.65)	2.84-4.45
≥ 75,000	9239	238 (3.70)	3.05-4.35
Education				0.133
≤ HS	18538	356 (3.00)	2.54-3.46
> HS	20100	467 (3.50)	3.06-3.94
Alcohol consumption status				< 0.0001
Never	4961	72 (1.86)	1.23-2.49
Current	28795	576 (3.26)	2.87-3.64
Past	4882	175 (4.41)	3.54-5.26
Asthma				< 0.0001
No	36088	697 (3.00)	2.68-3.31
Yes	2531	126 (7.68)	5.77-9.59
Diabetes				< 0.0001
No	37083	660 (2.71)	2.41-3.01
Yes	1546	163 (10.6)	8.55-12.74
Hypertension				< 0.0001
No	34490	510 (2.25)	1.96-2.54
Yes	4126	313 (7.57)	6.45-8.68

^a Abbreviations: AA, African American; HS, high school; CI, confidence interval.

^b Data are presented as No. (%).

^c P values are based on X² test.