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) |