| Age group | 3 years old group | 4 years old group | 5 years old group | 6 years old group |
| Children’s gender |
|
|
|
|
| Male | 10 | 10 | 9 | 9 |
| Female | 0 | 0 | 1 | 1 |
| Mother’s educational background |
|
|
|
|
| Under college | 5 | 5 | 5 | 5 |
| College and above | 5 | 5 | 5 | 5 |