Table 4.
Comparison of the adolescents’s sleep habits according to their IAS total scores
| IAS: <40 n (%) 836 (69) |
IAS: 40–69 n (%) 345 (28.5) |
IAS: >70 n (%) 31 (2.6) |
P* | |
|---|---|---|---|---|
| When do you usually get to bed in? (In hours, n %) | ||||
| 22:00: | 265 (75.3) | 79 (22.4) | 8 (2.3) | .001 |
| 23:00: | 355 (68.4) | 157 (30.3) | 7 (1.3) | *.001 |
| 24:00↑: | 216 (63.3) | 109 (32) | 16 (4.7) | |
| How much time does it take to fall asleep in the nights? | ||||
| 5–20 minutes | 673 (71.6) | 247 (26.3) | 20 (2.1) | .002 |
| At least 30 minutes | 88 (63.8) | 46 (33.3) | 4 (2.9) | *.001 |
| 30 minutes↑: | 75 (56) | 52 (38.8) | 7 (5.2) | |
| After falling asleep, how many times a night do you get awake? | ||||
| Never | 763 (69.4) | 314 (28.5) | 23 (2.1) | .001 |
| 1–4 times | 61 (68.5) | 24 (27) | 4 (4.5) | *.014 |
| 5–10 times | 12 (52.2) | 7 (30.4) | 4 (17.4) | |
| How often do you sleep after coming from school? | ||||
| Never or rarely | 547 (72.9) | 186 (24.8) | 17 (2.3) | .001 |
| Occasionally | 184 (62.6) | 105 (62.5) | 5 (1.7) | *.001 |
| Frequently | 105 (35.7) | 54 (32.1) | 9 (5.4) | |
| How do you grade your sleep quality? | ||||
| Good: | 471 (74.8) | 149 (23.7) | 10 (1.6) | .001 |
| Moderate: | 247 (64.3) | 129 (33.6) | 8 (2.1) | *.001 |
| Bad: | 118 (14.1) | 67 (33.8) | 13 (6.6) | |
Chi-square test and
*
Linear-by-Linear Association