Table 4.
Associations between weekday and weekend midpoint of sleep and overweight and obesity among adolescents (age 12–17, N = 1,254).
| Range of sleep midpoint | Sleep midpoint, quintiles, hour:min | p for trend | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Weekday | ||||||||||
| 12 a.m.–1:45 a.m. | 1:45 a.m. to < 2:10 a.m. | 2:10 a.m. to < 2:30 a.m. | 2:30 a.m. to < 2:55 a.m. | 2:55 a.m.–7 a.m. | ||||||
| OR 95% CI |
OR 95% CI |
OR 95% CI |
OR 95% CI |
OR 95% CI |
||||||
| Overall | ||||||||||
| Base model | Referent | 0.99 | (0.65, 1.51) | 1.26 | (0.79, 2.02) | 1.21 | (0.79, 1.85) | 0.95 | (0.60, 1.51) | 0.76 |
| Model 2 | Referent | 1.01 | (0.66, 1.55) | 1.30 | (0.80, 2.11) | 1.25 | (0.81, 1.94) | 1.02 | (0.63, 1.65) | 0.53 |
| Model 3 | Referent | 1.13 | (0.67, 1.91) | 1.32 | (0.74, 2.37) | 1.49 | (0.87, 2.56) | 1.04 | (0.59, 1.85) | 0.88 |
| Female | ||||||||||
| Base model | Referent | 0.90 | (0.50, 1.61) | 0.95 | (0.48, 1.84) | 0.92 | (0.58, 1.94) | 1.17 | (0.54, 1.81) | 0.60 |
| Model 2 | Referent | 0.86 | (0.47, 1.57) | 0.96 | (0.48, 1.90) | 0.96 | (0.52, 1.78) | 1.38 | (0.71, 2.65) | 0.31 |
| Model 3 | Referent | 0.95 | (0.50, 1.78) | 0.81 | (0.39, 1.68) | 0.85 | (0.44, 1.63) | 1.23 | (0.61, 2.48) | 0.76 |
| Male | ||||||||||
| Base model | Referent | 1.10 | (0.60, 2.03) | 1.68 | (0.85, 3.34) | 1.58 | (0.85, 2.95) | 0.81 | (0.41, 1.60) | 0.94 |
| Model 2 | Referent | 1.20 | (0.63, 2.27) | 1.79 | (0.87, 3.68) | 1.68 | (0.87, 3.25) | 0.79 | (0.38, 1.65) | 0.87 |
| Model 3 | Referent | 1.26 | (0.65, 2.43) | 1.76 | (0.84, 3.70) | 1.69 | (0.85, 3.34) | 0.73 | (0.34, 1.56) | 0.64 |
| Weekend | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Midpoint range of sleep | < 3:30 a.m. | 3:30 a.m. to < 4 a.m. | 4 a.m. to < 4:30 a.m. | 4:30 a.m. to < 5:05 a.m. | ≥ 5:05 a.m. | |||||
| Overall | ||||||||||
| Base model | Referent | 0.85 | (0.55, 1.32) | 1.21 | (0.80, 1.85) | 1.36 | (0.92, 1.99) | 1.22 | (0.80, 1.85) | 0.07 |
| Model 2 | Referent | 0.83 | (0.53, 1.30) | 1.09 | (0.70, 1.68) | 1.15 | (0.77, 1.71) | 1.12 | (0.73, 1.72) | 0.27 |
| Model 3 | Referent | 0.76 | (0.44, 1.32) | 1.28 | (0.76, 2.17) | 1.35 | (0.84, 2.20) | 1.16 | (0.68, 1.98) | 0.53 |
| Female | ||||||||||
| Base model | Referent | 0.94 | (0.46, 1.90) | 1.95 | (1.03, 3.71) | 2.17 | (1.20, 3.92) | 1.78 | (0.95, 3.33) | 0.01 |
| Model 2 | Referent | 0.91 | (0.44, 1.87) | 1.82 | (0.93, 3.55) | 1.85 | (1.00, 3.45) | 1.79 | (0.93, 3.45) | 0.02 |
| Model 3 | Referent | 0.94 | (0.44, 2.01) | 1.81 | (0.90, 3.63) | 1.82 | (0.96, 3.47) | 1.68 | (0.85, 3.33) | 0.04 |
| Male | ||||||||||
| Base model | Referent | 0.78 | (0.44, 1.40) | 0.83 | (0.47, 1.47) | 0.94 | (0.55, 1.58) | 0.87 | (0.49, 1.55) | 0.86 |
| Model 2 | Referent | 0.73 | (0.40, 1.34) | 0.71 | (0.39, 1.29) | 0.73 | (0.42, 1.27) | 0.69 | (0.38, 1.28) | 0.28 |
| Model 3 | Referent | 0.73 | (0.39, 1.36) | 0.72 | (0.39, 1.33) | 0.67 | (0.38, 1.20) | 0.64 | (0.34, 1.21) | 0.17 |
Weekday consists of sunday to thursday evenings. Weekend consists of friday and saturday evenings.
Base model adjusted for sex (for overall analysis alone) and age.
Model 2: adjusted for covariates in base model and race, school type, parental marital status, home ownership, parental education.
Model 3: adjusted for covariates in model 2 and moderate-vigorous physical activity (MVPA), teen sedentary time, teen frequency of beneficial foods eaten, teen frequency of detrimental foods eaten, and time spent watching television.
p-for-interaction between sex and sleep timing: 0.45 for weekday and 0.01 for weekend sleep midpoint.
OR Odds ratio, 95% CI 95% confidence interval.