Table 1.
Characteristics of the younger and older adult sleep and wake groups
| Young adults | Older adults | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Sleep | Wake | Sleep | Wake | ||||||
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | p | |
| n | 25 | – | 24 | – | 23 | – | 26 | – | – |
| Gender (no. of males) | 6 | – | 12 | – | 13 | – | 10 | – | 0.27 |
| Age (years) | 22.38 | 1.79 | 21.76 | 1.61 | 65.81 | 6.14 | 65.65 | 6.30 | <0.001 |
| Daily caffeine intake (cups) | 0.96 | 0.92 | 0.85 | 0.68 | 0.99 | 0.78 | 0.89 | 0.97 | 0.94 |
| Epworth Sleepiness Scale | 5.48 | 1.92 | 4.71 | 2.40 | 6.01 | 2.67 | 5.89 | 3.09 | 0.29 |
| Pittsburgh Sleep Quality Index | |||||||||
| Weekday bedtime† | 00:02 | 0.88 | 00:17 | 0.88 | 23:21 | 0.68 | 23:11 | 1.07 | <0.001 |
| Weekday wake time† | 07:52 | 0.81 | 08:06 | 0.78 | 07:37 | 0.96 | 07:30 | 0.91 | <0.001 |
| Weekday TST (h) | 7.23 | 0.73 | 7.26 | 0.84 | 6.67 | 0.94 | 6.95 | 0.86 | 0.12 |
| Weekend bedtime† | 00:20 | 0.99 | 00:21 | 0.97 | 23:18 | 0.86 | 23:16 | 1.00 | <0.001 |
| Weekend wake time† | 08:29 | 1.28 | 08:31 | 0.85 | 06:40 | 0.99 | 06:53 | 0.93 | <0.001 |
| Weekend TST (h) | 7.57 | 0.65 | 7.61 | 0.62 | 6.68 | 0.52 | 6.96 | 0.88 | <0.001 |
| Global score | 2.46 | 1.64 | 2.56 | 1.56 | 3.55 | 1.99 | 3.50 | 1.41 | 0.06 |
† Values for means in hh:mm.
p values from the ANOVA and Chi-squared tests contrasting the four groups are reported. Note. Within each age group, there were no significant contrasts between sleep and wake groups.