Table 1 Relationships between AIS score and examined factors among adolescents
Differentiating variables | AIS | Mann-Whitney U | |||||
|---|---|---|---|---|---|---|---|
Mean | SD | Median | Mean | SD | Median | Z | |
Using the phone before bedtime | YES (n = 2252) | NO (n = 112) | -0.572 | ||||
8.397 | 4.109 | 8.000 | 8.875 | 5.046 | 8.000 | ||
Sleeping alone in a room | YES (n = 2023) | NO (n = 341) | -0.190 | ||||
8.457 | 4.150 | 8.000 | 8.457 | 4.217 | 8.000 | ||
Awakenings during the night | YES (n = 1302) | NO (n = 1062) | -7.920 | ||||
9.006 | 4.138 | 9.000 | 7.698 | 4.071 | 7.000 | ||
Learning difficulties | YES (n = 1740) | NO (n = 624) | -18.141 | ||||
9.311 | 4.084 | 9.000 | 5.931 | 3.259 | 5.000 | ||
Memory problems | YES (n = 1165) | NO (n = 1199) | -16.736 | ||||
9.842 | 4.048 | 10.000 | 7.037 | 3.783 | 7.000 | ||
Worse academic performance | YES (n = 1756) | NO (n = 608) | -17.038 | ||||
9.247 | 4.092 | 9.000 | 6.028 | 3.348 | 5.000 | ||
Daytime naps | YES (n = 1811) | NO (n = 553) | -5.744 | ||||
8.681 | 4.1569 | 8.000 | 7.562 | 4.052 | 7.000 | ||
Smoking | YES (n = 736) | NO (n = 1628) | -7.689 | ||||
9.344 | 4.080 | 8.000 | 8.001 | 4.128 | 8.000 | ||