Table 1 Demographic characteristics of children and their families for the injury and control groups

Child mean age^a

8.05 ± 0.21

7.93 ± 1.74

0.671

8.06 ± 1.67

8.12 ± 1.59

0.705

Mother’s education^b

<0.01

0.011

 Primary school and below

1(1.4 %)

0

0

0

 Middle school

33(47.8 %)

65(86.7 %)

20(42.6 %)

9(18.8 %)

 College and above

35(50.7 %)

10(13.3 %)

27(57.4 %)

39(81.3 %)

Father’s education^b

<0.01

<0.01

 Primary school and below

1(1.4 %)

0

1(2.1 %)

0

 Middle school

30(43.5 %)

70(93.3 %)

24(50.1 %)

6(12.5 %)

 College and above

38(55.1 %)

5(6.7 %)

22(46.8 %)

42(87.5 %)

Marital status of family^b

0.013

0.096

 Married

63(91.3 %)

74(98.6)

44(93.6 %)

46(95.8 %)

 Divorced/Single

3(4.3 %)

1(1.4 %)

2(4.3 %)

1(2.1 %)

 Remarried

3(4.3 %)

0

1(2.1 %)

1(2.1 %)

Family Type^b

0.083

0.057

 Single-parent family

3(4.3 %)

1(1.3 %)

2 (4.3 %)

1(2.1 %)

 Nuclear family

49(71 %)

64(85.3 %)

31(66 %)

41(85.4 %)

 Extended family

17(24.7 %)

10(13.4 %)

13(27.7 %)

6(12.5 %)

Primary caregiver for child^b

0.024

0.111

 Parent(s)

45(66.7 %)

55(73.3 %)

35(74.5 %)

36(75 %)

 Grandparent(s)

13(18.8)

5(6.7 %)

9(19.1 %)

3(6.3 %)

 Babysitter

3(4.3 %)

0

1(2.1 %)

3(6.3 %)

 Other

8(10.2 %)

15(20 %)

2(4.3 %)

6(12.4 %)

Household income (per person per month in yuan)^b

0.369

0.081

 <1000

8(11.6 %)

10(13.3 %)

12(25.5 %)

3(6.3 %)

 1000–3000

23(33.3)

30(40 %)

14(34 %)

18(37.5 %)

 3000–5000

32(46.4 %)

30(40 %)

16(29.8 %)

24(50 %)

 >5000

6(8.7 %)

5(6.7 %)

5(10.6 %)

3(6.3 %)

Place of injury^b

 School

26(37.5 %)

13(28.6 %)

 Home

23(32.7 %)

19(39.7 %)

 Playground

11(15.4 %)

6(12.7 %)

 Street

10(14.4 %)

9(19 %)