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Family background information.
| Parents' education level | Parents' workplace | Only child or not | |||||
|---|---|---|---|---|---|---|---|
|
Junior school and below |
Senior school and above |
Local | Not local | Only child | Not only child | ||
| Shanghai | Father | 7.5% | 92.5% | 92.5% | 7.5% | 79.5% | 20.5% |
| Mother | 10.6% | 89.4% | 97.9% | 2.1% | |||
| Qingdao | Father | 51.3% | 48.7% | 95.6% | 4.4% | 32.4% | 67.6% |
| Mother | 57.8% | 42.2% | 98.1% | 1.9% | |||
