Table 3.
| b. Age and age-adjusted mean values of covariates by reported daytime napping duration in women | ||||
|---|---|---|---|---|
| Nap duration/day (minutes) | ||||
| 0a (n=713) |
<30 minutesb (n=252) |
≥30 minutesc (n=147) |
p-value | |
| Mean (SE) | Mean (SE) | Mean (SE) | ||
| Age (years) † | 72.1 (0.3) | 74.5 (0.4) | 76.5 (0.6) | <0.001 |
| BMI (kg/m2) ‡ | 24.0 (0.1) | 24.2 (0.2) | 24.5 (0.3) | 0.37 |
| Alcohol consumption (ml/week) ‡ | 88.2 (4.1) | 70.9 (6.8) | 66.9 (9.0) | 0.02 |
| Night-time sleep duration/day (hours) ‡ | 7.13 (0.05) | 7.14 (0.08) | 7.15 (1.11) | 0.99 |
| Beck Depression Inventory‡ | 6.6 (0.2) | 6.6 (0.3) | 8.2 (0.4) | 0.003 |
| % | % | % | ||
| Exercise (≥3 times/week) § | 81.4 | 75.7 | 71.8 | 0.02 |
| Some college§ | 65.4 | 67.5 | 65.1 | 0.81 |
| Smoking history§ | 51.8 | 49.2 | 46.9 | 0.50 |
| Diabetes§ | 7.5 | 8.0 | 11.1 | 0.35 |
| Hypertension§ | 39.9 | 39.2 | 48.5 | 0.13 |
| Coronary heart disease§ | 6.2 | 5.9 | 12.4 | 0.02 |
| Stroke§ | 5.2 | 2.0 | 9.3 | 0.005 |
| Cancer§ | 25.1 | 27.7 | 28.9 | 0.54 |
| Sleep-related medication use§* | 11.4 | 10.1 | 15.3 | 0.32 |
| Postmenopausal estrogen use§ | 28.5 | 26.9 | 28.9 | 0.89 |
*
Sleep-related medications: sedating antidepressants, antianxiety drugs, and hypnotics
†
ANOVA
‡
ANCOVA adjusted for age
§
Chi-square test
P for multiple comparison
in age, a–b and a–c: p<0.001, b–c: p=0.006
in alcohol consumption, a–b and a–c: p=0.03
in Beck Depression Inventory, a–c: p=0.001, b–c: p=0.003