Table 3. Mixed effects model associations between age, sex and day of week on key sleep/circadian outcome variables, clustering by school and individual.
| Age | Sex* | Weekday vs. weekend | ||||
|---|---|---|---|---|---|---|
| B (CI) | p | B (CI) | P | B (CI) | p | |
| L5 | -0.15 (-0.30, 0.001) |
0.052 | 0.07 (-0.45, 0.59) |
0.788 | -0.12 (-0.28, 0.04) |
0.133 |
| M10 | -6.01 (-8.67, -3.36) |
<0.001 | 7.68 (3.12, 12.25) |
0.001 | -15.62 (-24.44, -6.80) |
0.001 |
| SPT-window | -0.27 (-0.34, -0.21) |
<0.001 | -0.35 (-0.71, 0.01) |
0.057 | 0.59 (0.26, 0.91) |
<0.001 |
| Sleep duration | -0.20 (-0.25, -0.14) |
<0.001 | -0.29 (-0.60, 0.01) |
0.062 | 0.49 (0.29, 0.69) |
<0.001 |
| SPT-window meets recommended sleep duration* | 1.06 (0.61, 1.85) | 0.840 | 0.39 (0.11, 1.32) | 0.130 | 5.22 (1.80, 15.18) | 0.002 |
| Sleep efficiency | 0.01 (-1.4x10-3, 0.01) |
0.118 | -2.3x10-3 (-0.02, 0.02) |
0.811 | -4.7x10-3 (-0.01, 4.9x10-3) |
0.337 |
| Sleep onset (accelerometry) | 0.19 (0.05, 0.33) |
0.007 | -0.10 (-0.85, 0.65) |
0.792 | 0.87 (0.70, 1.04) |
<0.001 |
| Wake time (accelerometry) | -0.09 (-0.26, 0.08) |
0.310 | -0.49 (-0.92, -0.05) |
0.029 | 1.36 (1.05, 1.66) |
<0.001 |
| Subjective sleep onset | 0.18 (-0.30, 0.66) |
0.457 | -0.17 (-0.63, 0.29) |
0.470 | 1.19 (0.50, 1.89) |
0.001 |
| Subjective wake time | -0.16 (-0.32, 2.6x10-3) |
0.054 | -0.32 (-0.75, 0.12) |
0.159 | 2.14 (1.91, 2.36) |
<0.001 |
| Subjective sleep duration | -0.31 (-0.85, 0.23) |
0.262 | -0.17 (-0.27, -0.07) |
0.001 | 0.94 (0.47, 1.42) |
<0.001 |
N = 59 as sex was missing for two participants. Day: reference category = weekdays. Sex: reference category = F.
*Coefficients are linear mixed model coefficients and 95% CI for all variables apart from ‘SPT-window meets recommended sleep duration’ where coefficients are odds ratios (95% CI) from mixed-effects logistic regression CI = confidence interval.