Table 2.
Association between Indices of Sleep and Weight Change
| Model 1 (n=130) |
Model 2 n=130) |
Model 3 (n=123) |
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|---|---|---|---|---|---|---|---|---|---|
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| B Estimate | (95% CI) | p-value | B Estimate | (95% CI) | p-value | B Estimate | (95% CI) | p-value | |
| Bedtime (hh:mm) | −0.42 | (−1.01, 0.18) | 0.17 | −0.47 | (−1.07, 0.13) | 0.13 | −0.45 | (−1.08, 0.17) | 0.15 |
| Midpoint of sleep (hh:mm) | −0.32 | (−0.78, 0.13) | 0.16 | −0.33 | (−0.79, 0.12) | 0.15 | −0.35 | (−0.86, 0.16) | 0.18 |
| Waketime (hh:mm) | −0.28 | (−0.85, 0.29) | 0.33 | −0.23 | (−0.81, 0.35) | 0.43 | −0.33 | (−0.94, 0.27) | 0.28 |
| Regularity (per 10 minutes) | 0.06 | (−0.06, 0.18) | 0.34 | 0.06 | (−0.07, 0.18) | 0.39 | 0.08 | (−0.05, 0.21) | 0.23 |
| Sleep Duration (per hour) | −0.41 | (−1.08, 0.26) | 0.23 | −0.27 | (−0.96, 0.42) | 0.45 | −0.52 | (−1.26, 0.22) | 0.17 |
| Time in Bed (per hour) | −0.04 | (−0.64, 0.55) | 0.89 | 0.07 | (−0.53, 0.68) | 0.81 | −0.11 | (−0.76, 0.54) | 0.73 |
| SOL (per 10 minutes) | 1.13 | (0.42, 1.84) | <.01 | 1.17 | (0.45, 1.89) | <.01 | 1.01 | (0.19, 1.83) | 0.02 |
| WASO (per 10 minutes) | 0.11 | (−0.05, 0.27) | 0.17 | 0.11 | (−0.05, 0.27) | 0.17 | 0.12 | (−0.05, 0.29) | 0.17 |
| WASO (per 10 minutes) | −0.18 | (−0.50, 0.14) | 0.26 | −0.18 | (−0.50, 0.13) | 0.25 | −0.17 | (−0.51, 0.17) | 0.32 |
| Month | −0.12 | (−0.28, 0.05) | 0.16 | −0.12 | (−0.28, 0.05) | 0.16 | −0.13 | (−0.30, 0.05) | 0.17 |
| WASO*Month | 0.02 | (0.00, 0.05) | 0.04 | 0.02 | (0.00, 0.05) | 0.03 | 0.02 | (−0.00, 0.05) | 0.05 |
| Awakenings (per 5 events) | 0.13 | (−0.22, 0.48) | 0.47 | 0.15 | (−0.21, 0.50) | 0.41 | 0.17 | (−0.21, 0.55) | 0.38 |
| Awakenings (per 5 events) | −0.78 | (−1.48, −0.07) | 0.03 | −0.76 | (−1.46, −0.05) | 0.04 | −0.68 | (−1.43, 0.07) | 0.08 |
| Month | −0.23 | (−0.42, −0.03) | 0.02 | −0.23 | (−0.42, −0.03) | 0.03 | −0.22 | (−0.42, −0.01) | 0.04 |
| Awakenings*Month | 0.08 | (0.03, 0.13) | <.01 | 0.08 | (0.03, 0.13) | <.01 | 0.07 | (0.02, 0.13) | 0.01 |
| Sleep Efficiency (per 5%) | −0.60 | (−1.12, −0.08) | 0.02 | −0.57 | (−1.10, −0.03) | 0.04 | −0.60 | (−1.17, −0.03) | 0.04 |
Each measure of sleep was included as a predictor of weight (kg), adjusting for baseline weight. Model 1 included the measure of sleep, time, and baseline weight; Model 2 added age, BMI, race, ethnicity, completer, and intervention arm to Model 1; Model 3 added EI (kcal/d) and MVPA (min/wk) to Model 2. WASO- wake after sleep onset; SOL- sleep onset latency; Regularity was defined as the standard deviation of waketime