Table 2.
Descriptive characteristics.
| Total N = 81 | Evening Chronotypes N = 30 | Non-Evening Chronotypes N = 51 | Sig | |
|---|---|---|---|---|
|
| ||||
| Demographics | ||||
| Agea | 19.63 ± 1.17 | 19.65 ± 1.25 | 19.62 ± 1.12 | .926 |
| Sex, Femaleb | 55 (67.9%) | 21 (67.7%) | 34 (61.8%) | .981 |
| Race Whiteb | 56 (69.1%) | 19 (61.3%) | 37 (74.0%) | .682 |
| Blackb | 11 (13.6%) | 5 (16.1%) | 6 (12.0%) | |
| Asianb | 10 (12.3%) | 5 (16.1%) | 5 (10.0%) | |
| Otherb | 4 (4.9%) | 2 (6.5%) | 2 (4.0%) | |
| Sleep | ||||
| SMP Freea | 6:04 am ± 95 min | 7:02 am ± 83 min | 5:29 am ± 85 min | <0.001 |
| SMP NonFreea | 4:53 am ± 62 min | 5:24 am ± 53 min | 4:34 am ± 61 min | <0.001 |
| TST Freea | 8.12 hrs ± 70 min | 8.19 hrs ± 65 min | 8.09 hrs ± 73 min | 0.762 |
| TST NonFreea | 6.74 hrs ± 79 min | 6.15 hrs ± 82 min | 7.10 hrs ± 70 min | 0.002 |
| Alcohol Use Severity | ||||
| AUDITa | 5.19 ± 3.83 | 6.35 ± 4.05 | 4.46 ± 3.54 | 0.029 |
| Psychological | ||||
| IDSa | 13.49 ± 2.24 | 13.73 ± 2.41 | 13.34 ± 2.15 | 0.451 |
a
means ± standard deviation
b
N(%)
SMP = sleep midpoint; TST = total sleep time; AUDIT = Alcohol Use Disorder Identification Test; IDS = Inventory of Depressive Symptoms.