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Table 1 Sociodemographic characteristics of injury cases and controls, 2012

From: Type A personality, hostility, time urgency and unintentional injuries among Chinese undergraduates: a matched case–control study

Characteristic

Cases (n = 253)

Controls (n = 253)

Test statistic ( P-value)*

Quantitative or ordinal variables

Age (year, mean ± SD)

19.6 ± 1.17

19.6 ± 1.15

0.53 (0.594)

BMI (kg/m2, mean ± SD)

20.3 ± 2.56

20.2 ± 2.41

0.33 (0.744)

Annual per-capita income, Yuan

  

0.77 (0.442)

<2000

30 (11.9%)

30 (11.9%)

 

2000 ~ 10000

59 (23.3%)

73 (28.9%)

 

10000 ~ 30000

83 (32.8%)

71 (28.1%)

 

30000 ~ 50000

36 (14.2%)

41 (16.2%)

 

> 50000

45 (17.8%)

38 (15.0%)

 

Dichotomous variables

 

Exposure in pair

 
 

Both positive

Only in case

Only in control

Both negative

 

No. of siblings

44

62

59

88

0.514

Smoke

0

4

12

237

0.057

Drink

0

4

14

235

0.027

Sports

125

61

35

32

0.009

Club activity

96

69

48

40

0.054

  1. *: P value from paired samples t test (age, BMI), signed rank sum test (income), McNemar test (dichotomous variables).
  2. : Number of matched pairs in analysis is 253.