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Table 1 Demographic and clinical characteristics of adolescents with and without problematic Internet use

From: Moderating effects of depressive symptoms on the relationship between problematic use of the Internet and sleep problems in Korean adolescents

 

Adolescents without PIU (N = 614)

Adolescents with PIU (N = 152)

p

Age

14.93 ± 1.28

15.60 ± 1.51

< 0.0001

Gender (female)

260 (42.34%)

23 (15.13%)

< 0.0001

Mean computer use time on weekdays (S.D.)

1.42 ± 1.56

2.56 ± 2.14

< 0.0001

Mean computer use time on weekends (S.D.)

2.59 ± 2.72

4.97 ± 3.79

< 0.0001

Mean smartphone using time during weekdays (hours per day) (S.D.)

3.51 ± 3.43

4.27 ± 3.42

0.015

Mean smartphone use time on weekends (S.D.)

4.58 ± 4.13

5.53 ± 4.47

0.014

Total sleep duration on weekdays

7:10 ± 1:39

6:48 ± 1:32

0.006

Total sleep duration on weekends

9:17 ± 2:08

9:11 ± 2:10

0.572

Mean bedtime on weekdays

23:49 ± 1:26

24:08 ± 1:05

0.004

Mean bedtime on weekends

24:16 ± 1:31

24:52 ± 1:35

< 0.0001

Mean wake up time on weekdays

6:59 ± 1:02

6:58 ± 0:56

0.757

Mean wake up time on weekends

9:42 ± 1:44

10:12 ± 1:58

0.001

Insomnia severity index total

8.96 ± 4.14

10.43 ± 4.31

< 0.0001

Epworth sleepiness scale total

6.30 ± 3.96

7.69 ± 4.52

< 0.0001

School sleep habit survey: Sleep-wake behavior scale total

11.92 ± 6.67

14.00 ± 8.26

.001

School sleep habit survey: morningness-eveningness (M-E scale) scale total

25.89 ± 3.68

25.11 ± 3.58

0.021

Ratio of evening type by M-E scale

152 (24.76%)

46 (32.26%)

0.179

Ratio of morning type by M-E scale

157 (25.57%)

23 (15.13%)

0.007

Children’s depression inventory total

14.70 ± 7.60

18.70 ± 8.64

0.001

  1. PIU problematic Internet use, M-E morningness-eveningness