Table 2.

Unadjusted and adjusted associations between the predictor variables and injuries in a sample of 4,138 students in Shenzhen, China

Variables	Crude OR (95% CI)	Adjusted OR (95% CI)
Gender
Male	1.91 (1.59-2.30)	1.58 (1.30-1.93)
Female	1.00	1.00
Self-perceived agrypnia
None	1.00	1.00
Sometimes	1.65 (1.33-2.05)	1.64 (1.31-2.05)
Often	2.9 (2.19-3.85)	2.34 (1.74-3.14)
Having PE class
≤2 classes/week	1.00	1.00
>2 classes/week	1.33 (1.11-1.59)	1.25 (1.04-1.51)
Sexual behavior
No	1.00	1.00
Yes	2.10 (1.51-2.91)	1.46 (1.03-2.07)
Alcohol consumption
No	1.00	1.00
Yes	1.52 (1.25-1.85)	1.29 (1.06-1.59)
Physical fighting
No	1.00	1.00
Yes	2.66 (2.19-3.24)	1.84 (1.49-2.28)
Unsafe cycling
No	1.00	1.00
Yes	1.97 (1.63-2.38)	1.47 (1.20-1.80)
Skating in unsafe places
No	1.00	1.00
Yes	2.29 (1.64-3.20)	1.57 (1.10-2.24)

OR, odds ratio; CI, confidence interval; PE, physical education.

Adjusted for all variables in Table 1.