Table 1 Characteristics of survey sample at baseline
| Â | Intervention N = 340 (%) | Control N = 258 (%) | P value |
|---|---|---|---|
Age | Â | Â | 0.046 |
<20 years | 32.0 | 22.9 | Â |
20–24 years | 61.5 | 69.4 |  |
>24 years | 6.5 | 7.7 | Â |
Lived in Shanghai | Â | Â | 0.014 |
<6 month | 5.0 | 0.8 | Â |
6 month – 2 year | 69.7 | 73.6 |  |
>2 year | 25.3 | 25.6 | Â |
Education | Â | Â | 0.776 |
<10 grade | 6.8 | 8.2 | Â |
High school | 90.9 | 89.9 | Â |
College and above | 2.3 | 1.9 | Â |
Has a boyfriend | 55.2 | 51.6 | 0.402 |