Table 3 Results of multivariate stepwise logistic regression for injury impact factors

Sex

 Girls

1.000

 Boys

0.564

0.130

18.817

0.000

1.758 (1.362–2.268)

Grade

 1–3

1.000

 4–6

0.309

0.182

2.875

0.090

1.363 (0.953–1.948)

 7–9

0.368

0.184

4.021

0.045

1.445 (1.008–2.070)

 10–12

−0.096

0.200

0.230

0.632

0.908 (0.613–1.345)

Residence

 Urban

1.000

 Suburban

0.385

0.161

5.741

0.017

1.470 (1.073–2.014)

 Exurban

0.486

0.159

9.312

0.002

1.626 (1.190–2.221)

Health Status

 Good

1.000

 Fair

0.394

0.145

7.388

0.007

1.483 (1.116–1.971)

 Bad

1.254

0.414

9.174

0.002

3.505 (1.557–7.892)

Personality

 Introvert

1.000

 Middle

0.676

0.269

6.296

0.012

1.966 (1.159–3.334)

 Extrovert

1.056

0.273

14.923

0.000

2.876 (1.683–4.915)

Number of siblings

 ≥1

1.000

 0

0.473

0.163

8.427

0.004

1.605 (1.166–2.210)

Parents’ marriage

 In marriage

1.000

 Non-married

1.044

0.264

15.600

0.000

2.842 (1.692–4.771)

Number of people living together

 ≤3

1.000

 4–6

−0.166

0.159

1.083

0.298

0.847 (0.620–1.158)

 ≥7

0.734

0.343

4.568

0.033

2.083 (1.063–4.082)