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Characteristics of the Baseline IDU Samples
| Characteristic | China (n = 294) | Vietnam (n = 348) |
| Male | 90% | 99% |
| Age 21–30 | 68% | 72% |
| Ethnic Minority1 | 72% | 51% |
| Married | 26% | 32% |
| Never Married | 68% | 63% |
| HIV Prevalence | 16% | 46% |
| Previous HIV test | 7% | 34% |
1. Defined as a respondent not of Han ethnicity in China and not of Kinh ethnicity in Vietnam.
