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Table 2 Sample characteristics (N = 1040)

From: The link between problematic internet use, problematic gaming, and psychological distress: does sleep quality matter?

Variable N/Mean %(N)/SD
Gender
 Male 416 40.0%
 Female 624 60.0%
Class standing
 1st year 264 25.4%
 2nd year 491 47.2%
 3rd year and above 285 27.4%
Annual family income
  < 50,000 yuan 241 23.2%
 50,000 to < 100,000 yuan 309 29.7%
 100,000 to < 200,000 yuan 302 29.0%
  > 200,000 yuan 188 18.1%
Academic achievement
 Top 20% 323 31.1%
 Average 564 54.2%
 Bottom 20% 153 14.7%
Father’s education
 Junior high school or below 381 36.6%
 Senior high school 258 24.8%
 College and above 401 38.6%
Mother’s education
 Junior high school or below 436 41.9%
 Senior high school 250 24.0%
 College and above 354 34.0%
Physical activity 2.36 0.06
 0 days/week 210 20.2%
 1 days/week 189 18.2%
 2 days/week 212 20.4%
 3 days/week 200 19.2%
 4–7 days/week 229 22.0%
Substance use
 None 736 70.8%
 1 type 137 13.2%
 2 or more types 167 16.1%
Problematic internet use 54.09 0.51
(Skewness, kurtosis) (0.39) (0.05)
Problematic gaming 16.41 0.22
(Skewness, kurtosis) (0.87) (−0.38)
Sleep quality 5.45 0.09
(Skewness, kurtosis) (0.52) (0.11)
Psychological distress 54.65 2.05
(Skewness, kurtosis) (1.69) (2.91)
Subscales
 Somatization 6.07 0.27
 Obsessive compulsiveness 8.09 0.25
 Interpersonal sensitivity 6.38 0.23
 Depression 8.81 0.33
 Anxiety 5.58 0.24
 Hostility 3.40 0.14
 Phobic anxiety 3.35 0.16
 Paranoid ideation 3.31 0.14
 Psychoticism 5.62 0.24