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Table 1 Demographic variables and mobile phone usage

From: Mobile phone addiction and depression among Chinese medical students: the mediating role of sleep quality and the moderating role of peer relationships

Variables

n

%

P

Gender

  

0.754

 Male

174

38.7

 

 Female

276

61.3

 

Major

  

0.278

 Clinical medicine

382

84.9

 

 No clinical medicine

68

15.1

 

Only child

  

0.000***

 Yes

253

56.2

 

 No

197

43.8

 

Family income per month

  

0.050*

 <3000 RMB

32

7

 

 3000–6000 RMB

120

26.7

 

 6000–9000 RMB

114

25.3

 

 >9000 RMB

184

40.9

 

Cost of living per month

  

0.244

 <1000 RMB

37

8.2

 

 1000–1500 RMB

176

39.1

 

 1500–2000 RMB

170

37.8

 

 >2000 RMB

67

14.9

 

Family area

  

0.001**

 Cities and towns

341

75.8

 

 Countryside

109

24.2

 

Types of family

  

0.926

 Complete family

395

87.8

 

 Incomplete family

55

12.2

 

Class cadre

  

0.982

 Yes

169

37.6

 

 No

281

62.4

 

The number of years of mobile internet access

  

0.13

  < 2 years

47

10.4

 

 2–4 years

129

28.7

 

  > 4 years

274

60.9

 

Time spent on the phone every day

  

0.000***

  < 4 hours

82

18.2

 

 4–6 hours

191

42.4

 

  > 6 hours

177

39.3

 

Monthly mobile phone consumption

  

0.561

  < 30 RMB

49

10.9

 

 30–50 RMB

179

39.8

 

 50–100 RMB

123

27.3

 

 100–150 RMB

38

8.4

 

  > 150 RMB

61

13.6

 
  1. *p < 0.05
  2. **p < 0.01
  3. ***p < 0.001