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Table 4 Comparison of smartphone use frequency between normal internet users and problematic internet users

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

Age Smartphone use frequency Normal internet users, n (%) (N = 173) Problematic internet users, n (%) (N = 58) p (Fisher’s exact test)
Total (N = 231) I don’t use it at all 48 (27.7) 13 (22.4) <0.001**
I hardly use it 8 (4.6) 1 (1.7)  
I sometimes use it 21 (12.1) 0  
I often use it 40 (23.1) 2 (3.4)  
I use it really often 56 (32.4) 42 (72.4)  
20–29 (N = 49) I don’t use it at all 2 (7.7) 2 (8.7) 0.016*
I hardly use it 1 (3.8) 0  
I sometimes use it 2 (7.7) 0  
I often use it 8 (30.8) 1 (4.3)  
I use it really often 13 (50.0) 20 (87.0)  
30–39 (N = 51) I don’t use it at all 5 (13.5) 3 (21.4) 0.12
I hardly use it 3 (8.1) 0  
I sometimes use it 2 (5.4) 0  
I often use it 9 (24.3) 0  
I use it really often 18 (48.6) 11 (78.6)  
40–49 (N = 72) I don’t use it at all 20 (33.3) 4 (33.3) 0.14
I hardly use it 3 (5.0) 0  
I sometimes use it 11 (18.3) 0  
I often use it 12 (20.0) 1 (8.3)  
I use it really often 14 (23.3) 7 (58.3)  
50–59 (N = 35) I don’t use it at all 7 (24.1) 2 (33.3) 0.29
I hardly use it 1 (3.4) 1 (16.7)  
I sometimes use it 3 (10.3) 0  
I often use it 9 (31.0) 0  
I use it really often 9 (31.0) 3 (50.0)  
60–69 (N = 19) I don’t use it at all 9 (56.3) 2 (66.7) 1.00
I hardly use it 0 0  
I sometimes use it 3 (18.8) 0  
I often use it 2 (12.5) 0  
I use it really often 2 (12.5) 1 (33.3)  
70 < (N = 5) I don’t use it at all 5 (100.0) 0 1.00
I hardly use it 0 0  
I sometimes use it 0 0  
I often use it 0 0  
I use it really often 0 0  
  1. *: p < 0.05, **: p < 0.001