Table 2.
Distribution of self-reported daily sleeping hours (row percentage) by selected characteristics among 135,685 men and women in the Multiethnic Cohort Study, 1993-1996a
| Variable | Age-adjusted row percentage |
|||||
|---|---|---|---|---|---|---|
| Daily sleeping |
||||||
| ≤5 hr | 6 hr | 7 hr | 8 hr | ≥9 hr | P-valueb | |
| Number of subjects (Row %) | 11,841 (8.7%) | 33,711 (24.8%) | 44,711 (33.0%) | 34,110 (25.1%) | 11,312 (8.3%) | |
| Ethnicity | <0.01 | |||||
| White | 4.7 | 18.9 | 35.9 | 30.9 | 9.7 | |
| African American | 14.5 | 26.7 | 26.4 | 22.7 | 9.8 | |
| Native Hawaiian | 13.4 | 27.3 | 28.2 | 22.2 | 8.9 | |
| Japanese American | 7.9 | 30.2 | 36.4 | 20.6 | 5.0 | |
| Latino | 9.4 | 22.2 | 30.3 | 27.5 | 10.7 | |
| Age at entry, years | <0.01 | |||||
| 45-64 | 8.6 | 25.7 | 33.8 | 24.3 | 7.6 | |
| 65-69 | 8.8 | 22.8 | 31.6 | 27.0 | 9.9 | |
| 70+ | 9.4 | 22.8 | 30.2 | 27.2 | 10.3 | |
| Sex | <0.01 | |||||
| Men | 7.8 | 25.0 | 33.2 | 25.4 | 8.5 | |
| Women | 9.5 | 24.8 | 32.7 | 24.9 | 8.1 | |
| Education | 0.82 | |||||
| High school or some college | 9.7 | 24.8 | 31.2 | 25.2 | 9.1 | |
| College graduate/postgraduate | 6.3 | 24.9 | 36.8 | 25.3 | 6.8 | |
| Married | <0.01 | |||||
| Yes | 11.3 | 26.2 | 30.6 | 23.5 | 8.4 | |
| No | 7.5 | 24.2 | 34.0 | 25.9 | 8.3 | |
| Diabetes | 0.12 | |||||
| Yes | 11.8 | 24.9 | 28.1 | 24.4 | 10.7 | |
| No | 8.5 | 24.9 | 33.4 | 25.2 | 8.1 | |
| Hypertension | <0.01 | |||||
| Yes | 10.2 | 26.1 | 30.8 | 24.1 | 8.8 | |
| No | 8.0 | 24.4 | 34.0 | 25.6 | 8.1 | |
| Smoking | <0.01 | |||||
| Nonsmoker | 9.0 | 25.4 | 33.7 | 24.4 | 7.5 | |
| Former smoker | 7.9 | 24.3 | 33.2 | 26.0 | 8.6 | |
| Current smoker | 9.5 | 24.3 | 30.4 | 25.5 | 10.3 | |
| Body mass index, kg/m2 | 0.22 | |||||
| Non-obese (<25.0) | 7.4 | 24.6 | 35.4 | 25.2 | 7.4 | |
| Overweight (25.0-29.9) | 9.1 | 25.2 | 31.8 | 25.3 | 8.6 | |
| Obese (≥30.0) | 11.8 | 24.4 | 28.2 | 24.7 | 10.9 | |
| Physical activity, METs/weekc | <0.01 | |||||
| <15.4 (men), <10.0 (women) | 11.1 | 24.8 | 29.4 | 24.9 | 9.8 | |
| 15.4-33.3 (men), 10.0-20.7 (women) | 9.2 | 26.2 | 32.7 | 24.2 | 7.7 | |
| 33.4-63.9 (men), 20.8-45.9 (women) | 7.7 | 25.2 | 34.7 | 24.8 | 7.7 | |
| ≥64.0 (men), ≥46.0 (women) | 7.5 | 23.4 | 34.2 | 26.6 | 8.3 | |
| Sitting watching television, h/day | <0.01 | |||||
| < 1 | 10.2 | 25.0 | 32.4 | 24.8 | 7.6 | |
| 1-4 | 8.1 | 25.0 | 33.6 | 25.3 | 8.0 | |
| ≥5 | 11.7 | 23.8 | 26.9 | 24.6 | 12.9 | |
| Calorie intake, Kcal/day | <0.01 | |||||
| <2,184 (men), <1,747 (women) | 8.4 | 25.4 | 34.2 | 24.8 | 7.2 | |
| ≥2,184 (men), ≥1,747 (women) | 9.0 | 24.3 | 31.7 | 25.5 | 9.4 | |
| Alcohol intake, g/day | <0.01 | |||||
| <2.8 (men), zero (women) | 9.7 | 26.0 | 32.0 | 24.2 | 8.1 | |
| ≥2.8 (men), >0 (women) | 7.5 | 23.5 | 34.0 | 26.2 | 8.8 | |
Abbreviation: METs, metabolic equivalent of task.
a
Data are presented as row percentage unless otherwise indicated. Row percentage are adjusted for age through age standardization across 5 year age groups.
b
P Value for the difference of mean between subgroups adjusted for age based on analysis of variance.
c
METs for moderate activity, vigorous work and strenuous sports.