Table 3.
Continuous associations with body mass index z-score per 1 standard deviation increase in rest–activity parameters
| Beta coefficient (95% confidence interval); p value | |||
|---|---|---|---|
| Model 1 | Model 2 | Model 3 | |
| Mesor | –0.16 (–0.31, –0.02) | –0.17 (–0.32, –0.03) | 0.32 (–0.05, 0.69) |
| p = 0.03 | p = 0.02 | p = 0.09 | |
| Acrophase | 0.06 (–0.07, 0.20) | 0.06 (–0.08, 0.19) | 0.06 (–0.08, 0.19) |
| p = 0.38 | p = 0.41 | p = 0.42 | |
| Relative amplitude | –0.16 (–0.29, –0.02) | –0.16 (–0.3, –0.02) | –0.12 (–0.26, 0.01) |
| p = 0.02 | p = 0.03 | p = 0.08 | |
| Interdaily stability | –0.08 (–0.22, 0.05) | –0.08 (–0.22, 0.06) | 0.06 (–0.11, 0.22) |
| p = 0.23 | p = 0.25 | p = 0.51 | |
| Intradaily variability | 0.12 (–0.02, 0.26) | 0.12 (–0.02, 0.26) | 0.1 (–0.03, 0.24) |
| p = 0.08 | p = 0.10 | p = 0.14 | |
| M10 midpoint | –0.06 (–0.19, 0.08) | –0.06 (–0.19, 0.08) | –0.04 (–0.18, 0.09) |
| p = 0.42 | p = 0.39 | p = 0.52 | |
| L5 midpoint | 0.06 (–0.07, 0.19) | 0.05 (–0.08, 0.18) | 0.03 (–0.1, 0.16) |
| p = 0.40 | p = 0.43 | p = 0.63 | |
| CFI | –0.16 (–0.3, –0.02) | –0.16 (–0.3, –0.01) | –0.07 (–0.23, 0.09) |
| p = 0.03 | p = 0.03 | p = 0.41 | |
(Model 1) Adjusted for age, sex, school, and grade. (Model 2) Model 1 + total sleep duration. (Model 3) Model 1 + daytime motor activity.
M10 midpoint, timing of most active 10-h episode; L5 midpoint, timing of the least active 5 episode; CFI, circadian function index.