Table 1.
Characteristics of the sub-sample of Jackson Heart Study Sleep participants and by categories of actigraphy-measured sleep duration, the Jackson Heart Sleep Study N = 231
| Characteristics | Total N = 231 (100%) |
< 6 hours N = 48 (20.8%) |
≥ 6 hours N = 183 (79.2%) |
|---|---|---|---|
| Age (years), mean (SD) | 66.3 (10.8) | 65.5 (10.2) | 66.5 (11.0) |
| Male, (%) | 30.3% | 33.3% | 29.5% |
| Educational attainment, (%) | |||
| < High school | 15.1% | 18.8% | 14.2% |
| High school or GED | 19.0% | 14.6% | 20.2% |
| Some college/training | 21.2% | 14.6% | 23.0% |
| Bachelor degree or higher | 44.6% | 52.1% | 42.6% |
| BMI (kg/m2), mean (SD) | 31.3 (6.7) | 31.5 (7.7) | 31.2 (6.4) |
| Household environment | |||
| Feel unsafe at night (range: 1–5), mean (SD) | 1.9 (0.9) | 2.0 (1.0) | 1.9 (0.9) |
| Physically uncomfortable (range: 1–5), mean (SD) | 1.9 (0.8) | 1.9 (0.9) | 1.9 (0.7) |
| Uncomfortable temperature (range: 1–5), mean (SD) | 1.8 (0.6) | 1.8 (0.7) | 1.8 (0.5) |
| Noise disturbance (range: 1–3), mean (SD) | 1.5 (0.7) | 1.6 (0.7) | 1.4 (0.7) |
| Light disturbance, (%) | 36.8% | 39.6% | 36.1% |
| Unweighted score (range: 0–5), mean (SD) | 1.5 (0.4) | 1.5 (0.5) | 1.5 (0.4) |
| Weighted score by self-reported sleep duration (range: 0–5), mean (SD) | 1.5 (0.4) | 1.6 (0.5) | 1.5 (0.4) |
| Weighted score by actigraphy-measured sleep duration (range: 0–5), mean (SD) | 1.2 (0.5) | 1.3 (0.5) | 1.2 (0.5) |
| Weighted score by sleep efficiency (range: 0–5), mean (SD) | 1.7 (0.4) | 1.8 (0.5) | 1.7 (0.4) |
| Weighted score by WASO (range: 0–5), mean (SD) | 1.8 (0.5) | 1.8 (0.6) | 1.7 (0.4) |
| In-bed behaviors | |||
| Watch television, (%) | 77.9% | 70.8% | 79.8% |
| Listen to radio or music, (%) | 27.3% | 33.3% | 25.7% |
| Computer/tablet/phone use, (%) | 44.2% | 39.6% | 45.4% |
| Play video game, (%) | 7.4% | 6.3% | 7.7% |
| Read books, (%) | 56.7% | 60.4% | 55.7% |
| Eat meals or snack, (%) | 36.8% | 47.9% | 33.9% |
| Unweighted score (range: 0–1), mean (SD) | 0.4 (0.2) | 0.4 (0.3) | 0.4 (0.2) |
| Weighted score by self-reported sleep duration (range: 0–1), mean (SD) | 0.3 (0.3) | 0.4 (0.3) | 0.3 (0.3) |
| Weighted score by actigraphy-measured sleep duration (range: 0–1), mean (SD) | 0.4 (0.3) | 0.5 (0.4) | 0.4 (0.3) |
| Weighted score by sleep efficiency (range: 0–1), mean (SD) | 0.4 (0.2) | 0.4 (0.3) | 0.4 (0.2) |
| Weighted score by WASO (range: 0–1), mean (SD) | 0.4 (0.2) | 0.4 (0.3) | 0.4 (0.2) |
SD = standard deviation; BMI = body mass index; WASO = wake after sleep onset.