Table 3.
Adjusted BMI and Body Fat Percent by SWA-Derived Sleep Metrics Among by Sex
| SWA Sleep Metrics | BMI (kg/m2) | p-value | Cont. p | Body Fat % | p-value | Cont. p |
|---|---|---|---|---|---|---|
| Males | ||||||
|
| ||||||
| Sleep Onset | 0.74 | 0.28 | ||||
| <12:00AM | 25.6 (25.0–26.2) | REF | 20.4 (19.1–21.6) | REF | ||
| ≥12:00AM | 25.5 (24.9–26.1) | 0.76 | 20.4 (19.2–21.6) | 0.96 | ||
| Wake Time | 0.30 | 0.10 | ||||
| <8:00AM | 25.7 (25.1–26.3) | REF | 20.1 (18.9–21.2) | REF | ||
| ≥8:00AM | 25.4 (24.8–26.1) | 0.57 | 20.8 (19.5–22.0) | 0.43 | ||
| Sleep Duration | 0.02 | 0.54 | ||||
| <6 Hours | 25.5 (24.9–26.2) | 0.79 | 20.9 (19.4–22.4) | 0.91 | ||
| 6 – 7 Hours | 25.4 (24.8–26.0) | REF | 20.8 (19.4–22.2) | REF | ||
| >7 Hours | 24.8 (24.0–25.6) | 0.14 | 20.0 (18.2–21.8) | 0.43 | ||
| Sleep Latency | 0.12 | 0.35 | ||||
| <12 Minutes | 25.3 (24.7–25.8) | REF | 19.8 (18.5–21.0) | REF | ||
| ≥12 Minutes | 25.4 (24.8–26.0) | 0.67 | 20.9 (19.8–22.1) | 0.16 | ||
| WASO | 0.09 | 0.10 | ||||
| <50 Minutes | 25.1 (24.5–25.6) | REF | 19.6 (18.4–20.7) | REF | ||
| ≥50 Minutes | 25.6 (25.0–26.1) | 0.14 | 21.3 (20.1–22.5) | 0.03 | ||
| Sleep Efficiency | 0.03 | 0.12 | ||||
| <85% | 25.9 (25.1–26.1) | 0.02 | 21.1 (20.2–22.3) | <0.01 | ||
| ≥85% | 24.7 (24.1–25.4) | REF | 18.7 (17.3–20.1) | REF | ||
|
| ||||||
| Females | ||||||
|
| ||||||
| Sleep Onset | 0.03 | 0.09 | ||||
| <12:00AM | 25.3 (24.7–25.9) | REF | 33.7 (32.4–35.0) | REF | ||
| ≥12:00AM | 25.8 (25.2–26.5) | 0.15 | 34.7 (33.4–36.1) | 0.23 | ||
| Wake Time | 0.18 | <0.01 | ||||
| <8:00AM | 25.2 (24.7–25.8) | REF | 33.3 (32.1–34.5) | REF | ||
| ≥8:00AM | 26.0 (25.3–26.7) | 0.03 | 35.8 (34.3–37.2) | <0.01 | ||
| Sleep Duration | 0.17 | 0.05 | ||||
| <6 Hours | 25.4 (24.6–26.2) | 0.63 | 33.9 (31.9–35.8) | 0.54 | ||
| 6 – 7 Hours | 25.6 (25.0–26.2) | REF | 34.6 (33.1–36.0) | REF | ||
| >7 Hours | 24.8 (24.2–25.4) | 0.04 | 34.5 (32.9–36.1) | 0.92 | ||
| Sleep Latency | 0.09 | 0.15 | ||||
| <12 Minutes | 24.9 (24.4–25.5) | REF | 33.4 (32.1–34.7) | REF | ||
| ≥12 Minutes | 25.7 (25.2–26.3) | 0.02 | 35.1 (33.8–36.4) | 0.04 | ||
| WASO | 0.29 | 0.23 | ||||
| <50 Minutes | 25.0 (24.4–25.5) | REF | 33.8 (32.5–35.1) | REF | ||
| ≥50 Minutes | 25.6 (25.1–26.2) | 0.07 | 34.6 (33.3–35.9) | 0.32 | ||
| Sleep Efficiency | 0.09 | 0.49 | ||||
| <85% | 25.5 (25.0–26.0) | 0.10 | 34.2 (33.0–35.4) | 0.91 | ||
| ≥85% | 24.9 (24.2–25.6) | REF | 34.1 (32.7–35.5) | REF | ||
Cont. p: represents the p-value for the continuous form of the sleep metrics. BMI adjustments: All models adjusted for employment, race, perceived body image, current dieting, and social approval and bulimia scores. Bedtime and wake time models also were adjusted for children in household. Body Fat % adjustments: All models adjusted for sex, employment, perceived body image, and ideal body image. Sleep duration model was also adjusted for race. Abbreviations: BMI = body mass index; SWA = Bodymedia’s Sensewear® physical activity monitor; WASO = wake after sleep onset; REF = reference category.