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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