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Table 1 Demographic characteristics of the subjects (n = 4512)

From: The relationship between smartphone addiction and symptoms of depression, anxiety, and attention-deficit/hyperactivity in South Korean adolescents

  n %
Age (mean ± SD) 15.15 ± 1.62
Sex  
 Male 2034 45.1
 Female 2478 54.9
Grade year
 7th 891 19.7
 8th 994 22
 9th 689 15.3
 10th 749 16.6
 11th 776 17.2
 12th 413 9.2
SES
 High 1219 27
 Middle 2551 56.5
 Low 742 16.4
Family structure
 Both parents 3939 87.3
 Single parent 491 10.9
 Other 82 1.8
  1. SD standard deviation, SES socio-economic status