Table 2.
Overall sleep quality based on age and sleep time-related variables.
| Rate of overall sleep quality | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Very bad | Fairly bad | Fairly good | Very good | p values | |||||
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | ||
| Age (years) | 20.0 | 3.5 | 19.5 | 3.2 | 20.7 | 3.5 | 22.7 | 4.5 | 0.156 |
| Time to fall asleep (minutes) | 21.8 | 25.8 | 31.1 | 44.0 | 19.0 | 17.2 | 15.2 | 13.3 | 0.403 |
| Time to go to bed at night (o'clock) | 5.0 | 5.4 | 7.3 | 7.3 | 9.7 | 8.3 | 12.5 | 9.5 | 0.073 |
| Time to wake up in the morning (o'clock) | 6.9 | 1.3 | 7.1 | 1.3 | 7.3 | 2.5 | 9.3 | 3.5 | 0.047 |
| Total duration of sleep (hours) | 4.2 | 1.4 | 5.2 | 1.2 | 6.2 | 1.4 | 7.5 | 1.0 | <0.001 |
SD: standard deviation.