Table 2.
Actigraphy-based sleep parameters (n = 56)
| Overall | Weekend (Friday/Saturday) | Weekday (Sunday/Monday) | Paired t-test | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Sleep parameter | Mean | SD | Range | Mean | SD | Mean | SD | t | p |
| Sleep onset | 23:33 | 1:00 | 21:35 – 2:01 | 23:52 | 1:24 | 23:13 | 1:06 | 3.96 | <.001 |
| Midsleep | 3:49 | 0:54 | 2:06 – 6:06 | 4:16 | 1:08 | 3:22 | 0:58 | 6.47 | <.001 |
| Sleep offset | 8:07 | 0:52 | 6:35-10:11 | 8:41 | 1:02 | 7:32 | 1:05 | 7.19 | <.001 |
| Total sleep time (h) | 8.20 | 0.59 | 5.8 – 9.7 | 8.46 | 0.95 | 7.92 | 1.04 | -0.81 | ns |
| Sleep latency (min) | 20.44 | 10.13 | 6-72 | 20.28 | 17.58 | 22.52 | 14.26 | -1.02 | ns |
| Wake after sleep onset (min) | 24.99 | 24.42 | 4-98 | 21.07 | 20.69 | 23.91 | 24.12 | 1.49 | ns |
| Sleep efficiency (%) | 95.18 | 4.5 | 80-99 | 96.02 | 3.66 | 95.19 | 4.86 | 3.34 | 0.002 |
| Saturday-Sunday midsleep shift (h) | 0.82 | 1.15 | -2.00 – 3.02 | ||||||
NOTE: There were no significant sex-related differences on any sleep parameters, and only sleep onset significantly differed between pre/early and mid/late pubertal groups (t(54)=-2.09, p=0.04)