Table 3.
Descriptive and inferential statistics for daytime sleepiness, evening sleepiness, and sustained evening attention, as well as mood in chronotype subgroups.
| Characteristics | Slight late type (N = 8) | Moderate late type (N = 4) | Extreme late type (N = 6) | Statistics | |||||
|---|---|---|---|---|---|---|---|---|---|
| M | SD | M | SD | M | SD | F | p | η2 | |
| Daytime sleepiness | 15.5 | 3.46 | 15.5 | 2.65 | 15.5 | 3.89 | 0.00 | 1.000 | 0.000 |
| Evening sleepiness | |||||||||
| 3 h before BT | 4.75 | 1.83 | 4.75 | 1.26 | 5.83 | 1.17 | 1.00 | 0.390 | 0.118 |
| 2 h before BT | 5.25 | 1.58 | 5.75 | 0.50 | 6.83 | 1.17 | 2.60 | 0.107 | 0.257 |
| 1 h before BT | 5.50 | 1.41 | 6.25 | 1.50 | 7.83 | 0.75 | 6.00 | 0.012 | 0.444 |
| 0 h before BT | 6.88 | 1.36 | 7.50 | 1.29 | 8.00 | 0.89 | 1.51 | 0.253 | 0.168 |
| Evening attention | |||||||||
| RT 3 h before BT | 309.63 | 44.23 | 319.75 | 35.82 | 317.83 | 26.51 | 0.13 | 0.879 | 0.017 |
| RT 2 h before BT | 304.25 | 47.48 | 336.25 | 22.59 | 323.50 | 42.13 | 0.87 | 0.440 | 0.104 |
| RT 1 h before BT | 310.38 | 43.13 | 356.25 | 43.87 | 326.00 | 35.12 | 1.69 | 0.219 | 0.184 |
| RT 0 h before BT | 353.75 | 41.31 | 353.75 | 41.31 | 327.83 | 44.97 | 0.731 | 0.498 | 0.089 |
| Error % 3 h before BT | 2.42 | 1.45 | 1.66 | 0.27 | 2.19 | 0.78 | 0.631 | 0.546 | 0.078 |
| Error % 2 h before BT | 1.45 | 0.30 | 1.94 | 0.21 | 1.99 | 0.50 | 4.56 | 0.028 | 0.378 |
| Error % 1 h before BT | 1.87 | 0.61 | 4.38 | 2.60 | 2.57 | 0.79 | 4.88 | 0.23 | 0.394 |
| Error % 0 h before BT | 1.68 | 0.63 | 2.79 | 0.57 | 2.17 | 0.90 | 3.21 | 0.069 | 0.300 |
| Mood | |||||||||
| Depression | 7.00 | 5.24 | 9.00 | 3.83 | 13.67 | 5.85 | 2.85 | 0.089 | 0.151 |
| Anxiety | 5.75 | 2.71 | 6.00 | 6.73 | 12.00 | 5.66 | 3.29 | 0.066 | 0.305 |
| Stress | 7.00 | 4.00 | 8.50 | 5.26 | 13.00 | 9.78 | 1.42 | 0.273 | 0.159 |
M, mean; SD, standard deviation; BT, bedtime; RT, reaction time Go/NoGo task; error %, commission error percentage of Go/NoGo task; higher sleepiness scores reflect higher sleepiness, sustained evening attention, larger RT and error % reflect lower attention; Mood, higher scores represent higher prevalence of mood disturbances.