Table 1. Descriptive characteristicsa and exposure and outcome data on excluded and included participants.
| Excluded (n=595 (46.38%)) | Included (n=688 (53.62%)) | |||
|---|---|---|---|---|
| Overall | Male | Female | ||
| Baseline Age Mean (SD) (n = 1,147 (89.4%)) | 14.49 (0.286) | 14.48 (0.275) | 14.47 (0.29) | 14.47 (0.27) |
| Gender (n = 1,283 (100%)), N (%) | Male:264 (46.8%) | |||
| Female: 286 (42.43%) | n/a | 300 (43.60%) | 388 (56.40%) | |
| Ethnicity (n = 1,283, (100%)), N (%) | ||||
| Minority | 144 (24.20%) | 52 (7.56%) | 17(5.67%) | 35 (9.02%) |
| Not minority | 451 (75.80%)* | 636 (92.44%) | 283 (94.33%) | 353 (90.98%) |
| Acorn SES, n = 1,207 (94.1%), N (%) | ||||
| Wealthy Achievers | 274 (52.79%) | 388 (56.40 %) | 163 (54.33%) | 225 (57.99%) |
| Urban Prosperity | 36 (6.94 %) | 44 (6.40%) | 25 (8.33%) | 19 (4.90%) |
| Comfortably Off | 129 (24.86%) | 162 (23.55 %) | 68 (22.67%) | 94 (24.23%) |
| Moderate Means | 27 (5.20 %) | 28 (4.07%) | 11 (3.67%) | 17 (4.38%) |
| Hard Pressed | 53 (10.21 %) | 66 (9.59 %) | 33 (11.00%) | 33 (8.51%) |
| Device-measured Sleep Duration (n = 786 (61.3%)), Mean (SD) (hours:mins) | 7:44 (0:50) | 7:45 (0:48) | 7:35 (0:49)*** | 7:53 (0:46) |
| Device-measured Sleep Onset time (n = 786 (61.3%)) Mean (SD) (hours:mins) | 23:44 (1:10) | 23:38 (0:49) | 23:40 (0:47) | 23:37 (0:51) |
| Self-reported sleep duration n = 931 (72.6%) Mean (SD) (hours:mins) | 9:58 (0:57) | 9:09 (0:50) | 9:09 (0:48) | 9:07 (0:44) |
| Self-reported sleep onset time n = 931 (72.6%) Mean (SD) (hours:mins) | 22:41 (0:48)* | 22:34 (0:47) | 22:32 (0:41) | 22:35 (0:42) |
| MFQ Score (t1) n = 1160 (90.4%) Mean (SD) | 0.531 (0.339)*** | 0.403 (0.276) | 0.342 (0.23)*** | 0.451 (0.30) |
| MFQ Score (t2) n = 888 (69.29%) Mean (SD) | 0.504 (0.376)*** | 0.377 (0.305) | 0.280 (0.23)*** | 0.455 (0.33) |
| MFQ Score (t3) n = 1009 (78.6%) Mean (SD) | 0.461 (0.351)*** | 0.383 (0.290) | 0.311 (0.25)*** | 0.437 (0.31) |
| Stressful life events n = 1156 (90.1%) Mean (SD) | 0.663 (1.01)* | 0.521 (0.895) | 0.286 (0.57) | 0.700 (1.04) |
| Adversity n = 1140 (88.8%) N (%) | ||||
| None or mild | 282 (60.91%)** | 477 (70.46%) | 212 (71.14%) | 265 (69.92%) |
| Moderate/Severe | 181 (39.09%)** | 200 (29.54%) | 86 (28.86%) | 114 (30.08%) |
| Poor perceived family functioning n = 1,034 (80.6%) Mean (SD) | 21.47 (4.76)** | 20.62 (4.71) | 20.62 (4.56) | 20.62 (4.83) |
| Perceived friendship support = 1,133 (88.3%) Mean (SD) | 23.31 (4.27)** | 23.70 (4.15) | 23.77 (4.22) | 23.64 (4.11) |
a
Measure details (beyond exposures and outcome) are found in Supplementary table A1 missingness on covariates ranged from 38.7%-5.9% in included sample
*
p < 0.05
**
p < 0.01
***
p < 0.001, differences between included and excluded participants are shown in the excluded column, between males and females are shown in the males column MFQ scores presented are averaged item scores, ranging from 0-2.