Table 1.
Characteristics of study sample (N = 109)
| Mean | SD | |
|---|---|---|
| Age (years) | 16.77 | 1.07 |
| Sex (% male) | 45.00 | — |
| BMI (kg/m2) | 20.62 | 2.65 |
| Epworth Sleepiness Scale score | 7.72 | 3.38 |
| Pittsburgh Sleep Quality Index | ||
| Bedtime on weekdays (hh:mm) | 23:37 | 01:02 |
| Bedtime on weekends (hh:mm) | 00:06 | 01:03 |
| Waketime on weekdays (hh:mm) | 06:12 | 00:38 |
| Waketime on weekends (hh:mm) | 09:09 | 01:29 |
| TIB on weekdays, h | 6.59 | 1.06 |
| TIB on weekends, h | 9.03 | 1.16 |
| Global PSQI score | 4.87 | 2.16 |
| Morningness-Eveningness score | 49.83 | 7.47 |
| Beck-Depression Inventory score | 9.58 | 6.08 |
| Beck-Anxiety Inventory score | 9.92 | 7.00 |
| Cognitive Tasks | ||
| Raven’s Progressive Matrices score (# correct) | 9.17 | 1.90 |
| 10-min Psychomotor Vigilance Task median reaction time (ms)* | 268 | 28 |
| 2-min Symbol Digit Modalities Task score (# correct)* | 82.90 | 8.63 |
| 4-min Mental Arithmetic Task score (# correct)* | 63.49 | 16.85 |
| 3-Back Working Memory Task score (A')* | 0.94 | 0.05 |
*Mean of three test batteries (morning, afternoon, evening) conducted the day following the polysomnographic recording.
TIB, time in bed.