Table 3.
Multivariable Association of Previous Night Sleep and the Duration of the Next Day Nap in the Health ABC Sleep Study Participants Who Reported Naps (n = 159)
| Variable | Unit/referent | Percentage difference in nap duration per unit |
Percentage difference in nap duration per unit |
||
|---|---|---|---|---|---|
| (95% CI) | (unadjusted) | (95% CI) | fully adjusted model1 | ||
| Demographics | |||||
| Race | White | 18.3 | (0.4, 76.7) | 26.0 | (2.8, 104.0) |
| Gender | Male | −3.3 | (−19.5, 27.3) | −0.6 | (−21.4, 42.9) |
| Actigraphy measured sleep | |||||
| Previous night sleep duration (h) | Hour | −1.9 | (−6.6, 5.9) | −1.0 | (−6.1, 8.6) |
| Previous night - Movement and fragmentation | 1 SD | 0.4 | (−5.2, 12.5) | −0.5 | (−6.7, 12.0) |
| Health variables | |||||
| Depression score | 1 SD | 5.5 | (−2.9. 29.4) | 6.5 | (−4.3, 36.9) |
| Bodily pain last 30 days | None | −14.2 | (−31.9, 7.4) | −27.5 | (−48.9, −12.7) |
| Respiratory symptoms | None | −9.1 | (−25.6, 15.5) | −3.5 | (−22.8, 33.5) |
| Self reported diabetes | None | 34.1 | (11.9, 119.0) | 43.0 | (18.2, 143.6) |
| Fatigue | 1 SD | 3.2 | (−5.2, 24.6) | 5.8 | (−4.8, 34.9) |
Fully adjusted mixed model included total nighttime sleep duration (hours from actigraphy), movement and fragmentation index (nightly actigraphy), age (years), race, gender, BMI (kg/m2), depression, mental status, bodily pain in the last 30 days (yes/no), cardiovascular disease at the year 6 visit (yes/no), self-reported respiratory symptoms (yes/no), self-reported diabetes (yes/no), self reported number of times up each night, fatigue score. Only variables with a significance level of P ≤ 0.10 in univariate, logistic regression, or mixed-model analyses are shown here.
2Units for continuous variables approximate 1 standard deviation; for dichotomous variables, the referent group does not have the characteristic.