Table 1 Sample characteristics (N=30,287)
Characteristic | Subgroup | Frequency | Percentage (%) | 95% CI |
|---|---|---|---|---|
Gender | Female | 15,333 | 50.6 | 50.1鈥墌鈥�51.2 |
Male | 14,954 | 49.4 | 48.8鈥墌鈥�49.9 | |
Age | 6鈥�8 years | 10,233 | 33.8 | 33.3鈥墌鈥�34.3 |
9鈥�11 years | 8,355 | 27.6 | 27.1鈥墌鈥�28.1 | |
12鈥�14 years | 6,979 | 23.0 | 22.6鈥墌鈥�23.5 | |
15-17years | 4,720 | 15.6 | 15.2鈥墌鈥�16.0 | |
Residence | Rural | 11,595 | 38.3 | 37.7鈥墌鈥�38.8 |
Urban | 18,692 | 61.7 | 61.2鈥墌鈥�62.3 | |
Region | North China | 10,935 | 36.1 | 35.2鈥墌鈥�37.0 |
Central China | 16,474 | 54.4 | 53.6鈥墌鈥�55.2 | |
South China | 2,878 | 9.5 | 8.4鈥墌鈥�10.6 | |
Living situation | Living with parents | 27,699 | 91.5 | 91.1鈥墌鈥�91.8 |
Not living with parents | 2,588 | 8.5 | 8.2鈥墌鈥�8.9 | |
Children situation (one child) | Yes | 20,427 | 67.4 | 66.9鈥墌鈥�68.0 |
No | 9,860 | 32.6 | 32.0鈥墌鈥�33.1 | |
Household income (monthly) | Less than 5000 yuan | 9,426 | 31.1 | 30.6鈥墌鈥�31.6 |
5000鈥�12,000 yuan | 8,971 | 29.6 | 29.1鈥墌鈥�30.1 | |
more than 12,000 yuan | 3,328 | 11.0 | 10.6鈥墌鈥�11.3 | |
Unwilling to answer /don鈥檛 know | 8,562 | 28.3 | 27.8鈥墌鈥�28.8 | |
Mother鈥檚 age | 鈮も��35 years | 12,892 | 42.6 | 42.0鈥墌鈥�43.1 |
35鈥�45 years | 15,301 | 50.5 | 50.0鈥墌鈥�51.1 | |
鈮モ��45 years | 2,094 | 6.9 | 6.6鈥墌鈥�7.2 | |
Father鈥檚 age | 鈮も��35 years | 8,329 | 27.5 | 27.0鈥墌鈥�28.0 |
35鈥�45 years | 17,756 | 58.6 | 58.1鈥墌鈥�59.2 | |
鈮モ��45 years | 4,202 | 13.9 | 13.5鈥墌鈥�14.3 | |
Mother鈥檚 education level | Junior high school and below | 14,302 | 47.2 | 46.7鈥墌鈥�47.8 |
High school /vocational school | 7,854 | 25.9 | 25.4鈥墌鈥�26.4 | |
Junior college/bachelor鈥檚 degree and above | 8,131 | 26.8 | 26.3鈥墌鈥�27.3 | |
Father鈥檚 education level | Junior high school and below | 13,067 | 43.1 | 42.6鈥墌鈥�43.7 |
High school /vocational school | 8,359 | 27.6 | 27.1鈥墌鈥�28.1 | |
Junior college/bachelor鈥檚 degree and above | 8,861 | 29.3 | 28.7鈥墌鈥�29.8 |