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Table 1 Characteristics of the 2012 sample of Chinese adolescents (n = 14,221)

From: Interactions of problematic mobile phone use and psychopathological symptoms with unintentional injuries: a school-based sample of Chinese adolescents

Variables

Middle school

High school

PMPU

Psychopathological symptoms

PMPU

Psychopathological symptoms

n (%)

χ 2

n (%)

χ 2

n (%)

χ 2

n (%)

χ 2

Area

        

 Shenyang

407 (26.5)

 

231 (15.1)

 

650 (33.9)

 

645 (33.6)

 

 Xinxiang

343 (15.6)

223.37**

224 (10.2)

59.92**

452 (22.8)

149.14**

494 (24.9)

56.06**

 Guangzhou

575 (30.7)

 

290 (15.5)

 

281 (19.2)

 

348 (23.8)

 

 Chongqing

486 (36.8)

 

256 (19.4)

 

659 (33.9)

 

499 (25.7)

 

Gender

        

 Boys

863 (24.9)

5.57*

459 (13.3)

8.19*

946 (29.1)

3.78

823 (25.3)

10.42*

 Girls

948 (27.4)

 

542 (15.7)

 

1096 (27.0)

 

1163 (28.7)

 

Registered permanent residence

        

 Rural

733 (23.9)

15.17**

418 (13.6)

3.26

1000 (27.9)

0.006

1009 (28.2)

3.40

 Urban

1078 (28.0)

 

583 (15.2)

 

1042 (28.0)

 

977 (26.2)

 

Any siblings

        

 Yes

733 (23.4)

23.40**

430 (13.7)

2.67

931 (26.1)

11.44*

976 (27.4)

0.15

 No

1078 (28.5)

 

571 (15.1)

 

1111 (29.7)

 

1010 (27.0)

 

Perceived family economic

        

 Low

188 (31.6)

 

135 (22.7)

 

351 (27.3)

 

465 (36.1)

 

 Medium

1220 (25.2)

12.09*

676 (14.0)

36.71**

1462 (27.7)

3.13

1294 (24.5)

74.47**

 High

403 (27.2)

 

190 (12.8)

 

229 (30.7)

 

227 (30.4)

 

Parental expectations

        

 Low

46 (42.2)

 

38 (34.9)

 

31 (44.9)

 

39 (56.5)

 

 Medium

445 (28.2)

19.99**

254 (16.1)

43.35**

580 (28.2)

10.23*

508 (24.7)

37.28**

 High

1320 (25.3)

 

709 (13.6)

 

1431 (27.6)

 

1439 (27.8)

 

Academic performance

        

 Low

546 (35.9)

 

364 (23.9)

 

726 (32.7)

 

805 (36.2)

 

 Medium

963 (24.3)

99.38**

476 (12.0)

140.53**

1101 (26.2)

36.18**

972 (23.1)

131.79**

 High

302 (21.2)

 

161 (11.3)

 

215 (24.5)

 

209 (23.8)

 

Number of friends

        

 0

72 (34.8)

 

84 (40.6)

 

62 (25.4)

 

127 (52.0)

 

 1–2

410 (29.8)

26.36**

307 (22.3)

226.74**

426 (27.4)

2.56

534 (34.4)

148.50**

 3–5

693 (26.3)

 

331 (12.6)

 

933 (28.8)

 

814 (25.1)

 

  ≥6

636 (23.6)

 

279 (10.4)

 

621 (27.4)

 

511 (22.5)

 

Cigarette use

        

 Yes

203 (51.9)

141.92**

138 (35.3)

145.08**

387 (42.3)

106.89**

349 (38.1)

63.47**

 No

1608 (24.6)

 

863 (13.2)

 

1655 (25.9)

 

1637 (25.6)

 

Alcohol Use

        

 Yes

1220 (34.7)

269.32**

677 (19.3)

132.64**

1582 (31.3)

91.50**

1481 (29.3)

37.24**

 No

591 (17.4)

 

324 (9.5)

 

460 (20.4)

 

505 (22.4)

 
  1. PMPU refers to problematic mobile phone use, this applies to all tables that use the abbreviation
  2. *refers to P < 0.05; ** refers to P < 0.001