Table 1.
Distribution of Selected Characteristics Across Categories of Sleep Duration (N = 1949).
| Sleep duration | |||||
|---|---|---|---|---|---|
| Full sample (n = 1949) | <6 hours (n = 597) | 6–8 hours (n = 1135) | >8 hours (n = 217) | p | |
| Age (years) | 68.6 (9.1) | 68.5 (9.3) | 68.0 (8.9) | 72.1 (9.1) | <0.001 |
| Male (%) | 45.9 | 16.9 | 25.1 | 3.9 | <0.001 |
| Race (%) | <0.001 | ||||
| African American | 28.1 | 12.3 | 14.0 | 1.8 | |
| Hispanics | 22.1 | 6.8 | 12.2 | 3.0 | |
| Asian/Chinese | 11.5 | 4.0 | 6.6 | 0.9 | |
| Non-Hispanic white | 38.4 | 7.5 | 43.8 | 48.4 | |
| Education (%) | 0.02 | ||||
| <High school | 14.1 | 3.9 | 7.8 | 2.4 | |
| High school/GED | 16.2 | 5.7 | 8.9 | 1.7 | |
| Some college | 24.3 | 6.9 | 14.8 | 2.7 | |
| >college | 45.3 | 14.1 | 26.8 | 4.4 | |
| Employment (%) | <0.001 | ||||
| Employed | 40.5 | 13.3 | 24.7 | 2.5 | |
| Unemployed | 4.8 | 1.9 | 2.4 | 0.5 | |
| Retired | 45.6 | 13.3 | 25.8 | 6.5 | |
| Homemaker | 9.1 | 2.0 | 5.4 | 1.6 | |
| Household income (%) | <0.01 | ||||
| <$25000 | 25.5 | 8.8 | 13.3 | 3.5 | |
| $25000–$49000 | 27.9 | 8.7 | 16.3 | 2.8 | |
| $50000–$74000 | 18.1 | 5.5 | 10.4 | 2.2 | |
| $75000+ | 28.4 | 7.6 | 18.4 | 2.4 | |
| Married/living as married (%) | 60.9 | 16.7 | 38.2 | 6.0 | <0.001 |
| BMI (kg/m2) | 28.8 (5.5) | 29.6 (5.7) | 28.4 (5.4) | 28.2 (5.4) | <0.001 |
| Alcohol use (drinks per week) | 2.7 (6.7) | 2.6 (6.7) | 2.7 (6.4) | 3.3 (8.5) | 0.43 |
| Active smoker (%) | 6.7 | 3.0 | 2.8 | 0.9 | <0.001 |
| CES-D score | 8.2 (7.6) | 9.4 (8.0) | 7.6 (7.0) | 8.4 (8.6) | <0.001 |
| AHI (events/hour) | 20.2 (18.9) | 23.3 (20.2) | 18.7 (18.4) | 18.8 (17.2) | <0.001 |
All values expressed as percentage or mean (SD). AHI = apnea–hypopnea index; BMI = body mass index; CES-D = Center for Epidemiologic Studies Depression scale; GED = general educational development.