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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