Table 1.
Subject characteristics by sleep duration category.
| Variable | Category | Total sample | Very short sleep (<5 h) |
Short sleep (5–6 h) |
Normal sleep (7–8 h) |
Long sleep (9+ h) |
P-valuea |
|---|---|---|---|---|---|---|---|
| N (%) | 4548 (100) | 270 (5.9) | 1545(34.0) | 2424(53.3) | 309(6.8) | ||
| Age | Mean (SD) | 46.3 ± 16.5 | 45.8 ± 15.4 | 45.8 ± 16.6 | 46.6 ± 16.0 | 47.0 ± 20.1 | 0.6393 |
| Sex | Female (%) | 53.12 | 55.52 | 49.96 | 53.13 | 65.66 | 0.0027 |
| Male (%) | 46.88 | 44.48 | 50.04 | 46.87 | 34.34 | ||
| Race/ethnicity | Non-Hispanic White (%) | 71.56 | 61.51 | 66.84 | 74.49 | 77.02 | <0.0001 |
| Hispanic/Latino | 13.04 | 10.73 | 12.88 | 13.61 | 10.90 | ||
| Black/African American (%) | 10.87 | 22.94 | 14.44 | 7.85 | 9.80 | ||
| Asian/other (%) | 4.53 | 4.82 | 5.83 | 4.05 | 2.29 | ||
| Education | Less than high school (%) | 19.04 | 27.93 | 18.74 | 17.75 | 23.88 | <0.0001 |
| High school graduate (%) | 25.39 | 33.03 | 26.24 | 24.44 | 23.16 | ||
| Some college (%) | 30.06 | 32.71 | 33.55 | 28.28 | 26.59 | ||
| College graduate (%) | 25.52 | 6.33 | 21.48 | 29.53 | 26.36 | ||
| Income | <$20,000 (%) | 16.06 | 29.69 | 16.30 | 14.33 | 18.37 | <0.0001 |
| $20–$25,000 (%) | 7.18 | 8.44 | 7.22 | 6.37 | 12.67 | ||
| $25–$35,000 (%) | 11.85 | 17.85 | 12.18 | 10.91 | 13.36 | ||
| $35–$45,000 (%) | 8.89 | 6.65 | 9.43 | 9.13 | 6.15 | ||
| $45–$55,000 (%) | 8.34 | 7.79 | 7.53 | 8.41 | 11.95 | ||
| $55–$65,000 (%) | 7.05 | 7.11 | 7.80 | 6.51 | 8.05 | ||
| $65–$75,000 (%) | 7.60 | 11.66 | 6.72 | 8.14 | 3.90 | ||
| >$75,000 (%) | 33.03 | 10.80 | 32.83 | 36.22 | 25.54 | ||
| Minutes of exercise | Mean (SD) | 166 ± 223 | 222 ± 304 | 189 ±259 | 152 ±193 | 130± 206 | 0.0002 |
| Body Mass Index | Mean (SD) | 28.7 ± 6.8 | 29.7 ± 7.0 | 29.5 ± 7.4 | 28.3 ± 6.4 | 27.8 ± 6.8 | 0.0001 |
a
One-way ANOVA for continuous variables and X2 for categorical variables.