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Table 1 Descriptive statistics for physical characteristics, pubertal development, screen time, and depression at Grades 8 and 9— Korea Children and Youth Panel Study, 2011–2012

From: Pubertal development and screen time among South Korean adolescents: testing body mass index and psychological well-being as mediators

 

Scale

Grade 8 (n = 2276)

Grade 9 (n = 2226)

 

Boys

Girls

Boys

Girls

N (%)

 

1150 (50.5)

1126 (49.5)

1128 (50.7)

1098 (49.3)

Household income (1000 Korean won = USD 0.88) (%)

 Q1 (lowest-2,999,999)

 

21.0

20.4

 Q2 (3,000,000–4,199,999)

 

30.9

27.8

 Q3 (4,200,000–5,999,999)

 

21.3

25.5

 Q4 (6,000,000–highest)

 

26.8

26.3

Academic performance (M ± SD)

1–5

2.75 ± 0.82

2.76 ± 0.78

Height (M ± SD)

 

167.58 ± 7.09

159.41 ± 5.35*

171.26 ± 6.31

160.42 ± 5.30 *

Weight (M ± SD)

 

57.88 ± 11.62

50.18 ± 7.70*

61.25 ± 11.24

51.59 ± 7.15 *

BMI (M ± SD)

 

20.53 ± 3.49

19.73 ± 2.74*

20.85 ± 3.39

20.02 ± 2.51 *

Age (M ± SD)

 

12.15 ± 0.60

12.10 ± 0.59

13.16 ± 0.59

13.11 ± 0.63

Pubertal development (M ± SD)

0–6

1.27 ± 1.32

2.63 ± 1.12*

Depression (M ± SD)

1–5

3.15 ± 0.61

3.11 ± 0.61

2.99 ± 0.61

2.93 ± 0.63

Self-esteem (M ± SD)

1–5

2.84 ± 0.45

2.80 ± 0.01*

Screen time during weekdays (min)a

(M ± SD)

 Computer/video games

 

86.16 ± 65.88

84.35 ± 66.63

88.57 ± 67.11

69.83 ± 67.29

 TV watching

 

89.59 ± 66.87

96.78 ± 73.13*

84.06 ± 63.43

94.73 ± 75.38*

Screen time on weekends (min)a (M ± SD)

 Computer/video games

 

162.48 ± 104.59

135.15 ± 93.91

157.88 ± 102.58

114.87 ± 93.35 *

 TV watching

 

153.97 ± 95.95

170.37 ± 104.97

137.06 ± 89.12

168.91 ± 107.17*

Screen time total (min)a (M ± SD)

 

123.05 ± 55.77

121.66 ± 54.48

114.62 ± 55.21

109.38 ± 60.79 *

  1. Data were presented as means and standard deviations (M ± SD) or percentages (%)
  2. aScreen time: Computer/video games, watching television
  3. * p < 0.05, significant sex differences within the same grade
  4. p< 0.05, significant differences over time within sex