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Table 1 Demographics of the respondents

From: Problematic internet use and psychiatric co-morbidity in a population of Japanese adult psychiatric patients

   Normal internet users (N = 173) Problematic internet users (N = 58) p
Sex Male 69 (39.9%) 21 (36.2%) 0.10a
Female 104 (60.1%) 35 (60.3%)  
Transgender 0 2 (3.4)  
Age Mean, years (standard deviation) 43.6 (12.7) 35.9 (11.9) <0.001b**
20–29 26 (15.0%) 23 (39.7%)  
30–39 37 (21.4%) 14 (24.1%)  
40–49 60 (34.7%) 12 (20.7%)  
50–59 29 (16.8%) 6 (10.3%)  
60–69 16 (9.2%) 3 (5.2%)  
70–79 5 (2.9%) 0  
Education (highest level) Junior high school 8 (4.6%) 5 (8.6%) 0.59a
High school 57 (32.9%) 23 (39.7%)  
Junior college 25 (14.5%) 6 (10.3%)  
University 76 (43.9%) 22 (37.9%)  
Graduate school 7 (4.0%) 2 (3.4%)  
Employment status Employed/homemaker/studying 113 (65.3%) 29 (50.0%) 0.04c*
Unemployed 60 (34.7%) 29 (50.0%)  
Living situation With others 138 (79.8%) 47 (81.0%) 0.84c
Alone 35 (20.2%) 11 (19.0%)  
Marital status Married/living together 67 (38.7%) 17 (29.3%) 0.20c
Unmarried/divorced/separated/widowed 106 (61.3%) 41 (70.7%)  
Diagnosis ICD-10 F1 4 (2.3%) 1 (1.7%) 0.79c
ICD-10 F2 20 (11.6%) 6 (10.3%) 0.80c
ICD-10 F3 56 (32.4%) 17 (29.3%) 0.66c
ICD-10 F4 94 (54.3%) 37 (63.8%) 0.21c
ICD-10 F5 13 (7.5%) 3 (5.2%) 0.54c
Clinical Global Impression-Severity Median (interquartile range) 3 (3–4) 4 (3–4) 0.009b*
  1. Number of persons in each sex, age, education, employment, living situation, marital status, and diagnosis category
  2. aFisher’s exact test
  3. bMann-Whitney U test
  4. cChi-square test
  5. *: p < 0.05, **: p < 0.001