Table 1.
Longitudinal Measures at the Baseline
| Class | ||||||
|---|---|---|---|---|---|---|
| Early Start Class (ESC) | Late Start Class (LSC) | F (1,48) | p | Covariate (Gender) F (1,48) | p | |
| Weekly sleep diary | ||||||
| Light-off hour | 11:42pm (0.15) | 11:14pm (0.21) | 0.03 | 0.86 | 0.18 | 0.67 |
| Total Sleep Time | 463.5 (9.5) | 441.4 (10.4) | 2.58 | 0.12 | 0.22 | 0.64 |
| Sleep Onset Latency | 11.23 (1.62) | 9.24 (1.77) | 19.68 | 0.66 | 1.11 | 0.30 |
| Sleep Efficiency [(Total Sleep Time/Total Bed Time)*100] |
92.5 (0.8) | 94.9 (0.7) | 2.99 | 0.09 | 0.95 | 0.33 |
| Number of Awakenings | 0.70 (0.16) | 0.71 (0.18) | 0.47 | 0.50 | 3.94 | 0.05 |
| Wake-up hour | 7:37 (0.13) | 7:16 (0.19) | 1.99 | 0.16 | 0.22 | 0.64 |
| Psychomotor Vigilance Test (PVT) | ||||||
| Median RT (msec) | 291.3 (10.5) | 316.1 (10.6) | 1.88 | 0.18 | 0.21 | 0.65 |
| Speed | 3.48 (0.09) | 3.15 (0.09) | 4.72 | 0.03 | 0.02 | 0.89 |
| 10% slowest RT (msec) | 503.9 (35.1) | 658.2 (83.0) | 4.38 | 0.04 | 0.82 | 0.37 |
| 10% fastest RT(msec) | 222.3 (5.7) | 238.9 (6.2) | 3.77 | 0.05 | 0.17 | 0.68 |
| Karolinska Sleepiness Scale (KSS) | 3.47 (0.38) | 2.38 (0.42) | 2.68 | 0.11 | 0.21 | 0.64 |
Notes: Means (SE) of the weekly sleep diary, Psychomotor Vigilance Task (PVT), and Karolinska Sleepiness Scale (KSS). The table also reports the results of the ANCOVA comparing the two classes (ESC and LSC) with gender considered as a covariate. Bold values denote statistical significance at the p ≤ 0.05 level.