Table 3.
Sleep parameters in adolescents aged 12–14 with IA verified with Chen Internet Addiction Scale (CIAS).
| Sleep Parameters | Age 12–14 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Boys (n = 1009) | Girls (n = 1219) | |||||||||||
| AIU n = 575 |
MIU n = 376 |
IA n = 58 |
p | d | H | AIU n = 593 |
MIU n = 534 |
IA n = 92 |
p |
d | H | |
| Bedtime weekdays (in hours) |
23 (22–23) |
23 (22–24) |
23.5 (23–25) |
<0.001 | 0.478 | 56.36 | 23 (22–23) |
23 (23–24) |
23 (22–24) |
<0.001 | 0.411 | 51.16 |
| Waking up weekdays (in hours) |
7 (7–8) |
7 (7–9) |
8 (7–9) |
0.008 | 0.176 | 9.69 | 7 (6–8) |
7 (6–9) |
7 (6–9) |
0.016 | 0.144 | 8.28 |
| Total sleep weekdays (in hours) |
8.5 (7.7–9.5) |
8.3 (7.3–9.3) |
8.3 (7.3–9.1) |
0.004 | 0.193 | 11.22 | 8.3 (7.4–9.2) |
8.0 (7.0–9.0) |
7.8 (6.5–9.3) |
0.003 | 0.179 | 11.65 |
| Sleep onset latency (in minutes) |
10 (7–20) |
10 (10–30) |
15 (8–30) |
0.017 | 0.164 | 8.15 | 12 (10–20) |
15 (10–30) |
15 (10–30) |
<0.001 | 0.222 | 15.94 |
| Frequency of night awakenings (in points) |
0 (0–1) |
1 (0–1) |
1 (0–2) |
0.014 | 0.163 | 8.61 | 1 (0–1) |
1 (0–2) |
1 (0–2) |
<0.001 | 0.368 | 41.45 |
| PDSS score (in points) |
8 (5–12) |
11 (8–15) |
14 (10–18) |
<0.001 | 0.696 | 111.53 | 10 (7–14) |
14 (10–17) |
17 (14–20) |
<0.001 | 0.752 | 151.74 |
Note: Time is expressed in 24–hour clock time. AIU—adaptive Internet use; MIU—maladaptive Internet use; IA—Internet addiction. Data are presented as medians (25–75% quartiles). The Kruskal–Wallis H test was used. d—effect size (Cohen’s d) for Kruskal–Wallis H test calculated according to recommendations Fritz, Morris & Richler [45] with the public domain software https://www.psychometrica.de/effect_size.html (accessed on 2 October 2021).