Basic information

Number of case group (P%)

Number of control group (P%)

Basic information

Number of case group (P%)

Number of control group (P%)

Family role

Father’s occupation

Father

18 (16.1)

20 (19.2)

Self-employed or freelancer

17 (15.2)

14 (13.5)

Mother

74 (66.1)

80 (77.0)

Worker in enterprise and public institution

75 (67.0)

84 (80.8)

Grandparents

11 (9.8)

4 (3.8)

Farmer

9 (8.0)

1 (0.9)

Others

9 (8.0)

0 (0.0)

Unemployed

11 (9.8)

5 (4.8)

Age (x)

Mother’s occupation

x≤30

31 (27.6)

5 (4.8)

Self-employed or freelancer

13 (11.6)

17 (16.3)

30 < x ≤ 40

50 (44.6)

75 (72.1)

Worker in enterprise and public institution

42 (37.5)

66 (63.5)

40 < x ≤ 50

17 (15.2)

18 (17.3)

Farmer

11 (9.8)

2 (1.9)

50 < x ≤ 60

7 (6.3)

3 (2.9)

Unemployed

46 (41.1)

19 (18.3)

x > 60

7 (6.3)

3 (2.9)

Father’s education level

Gender of children

Master or above

6 (5.4)

8 (7.7)

Male

84 (75.0)

51 (49.0)

Undergraduate

48 (42.8)

44 (42.3)

Female

28 (25.0)

53 (51.0)

High school

24 (21.4)

32 (32.7)

Age of children(y)

Middle school

27 (24.1)

18 (17.3)

y ≤ 3

32 (28.6)

8 (7.7)

Elementary or below

7 (6.3)

0 (0.0)

3 < y ≤ 6

39 (34.8)

37 (35.6)

Mother’s education level

6 < y ≤ 9

24 (21.4)

11 (10.6)

Master or above

2 (1.8)

6 (5.8)

9 < y ≤ 12

9 (8.1)

48 (46.1)

Undergraduate

54 (48.2)

51 (49.0)

12 < y ≤ 15

5 (4.4)

0 (0.0)

High school

18 (16.1)

32 (30.8)

15 < y ≤ 18

3 (2.7)

0 (0.0)

Middle school

30 (26.8)

13 (12.5)

Age of children (y)

Elementary or below

8 (7.1)

2 (1.9)

y ≤ 3

32 (28.6)

8 (7.7)

Mother’s education level

3 < y ≤ 6

39 (34.8)

37 (35.6)

Master or above

2 (1.8)

6 (5.8)

6 < y ≤ 9

24 (21.4)

11 (10.6)

Undergraduate

54 (48.2)

51 (49.0)

9 < y ≤ 12

9 (8.1)

48 (46.1)

High school

18 (16.1)

32 (30.8)

12 < y ≤ 15

5 (4.4)

0 (0.0)

Middle school

30 (26.8)

13 (12.5)

15 < y ≤ 18

3 (2.7)

0 (0.0)

Elementary or below

8 (7.1)

2 (1.9)