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Distance from border and ethnic minority percentage among injecting drug users
| Vietnam | Ethnic minority | P Value | |
| Yes | No | ||
| Distance from the Border | |||
| 1 km | 29 (73%) | 11 (28%) | P = .0017 |
| 3 km | 20 (57%) | 15 (43%) | |
| 12 km | 29 (62%) | 11 (38%) | |
| 13 km | 29 (64%) | 16 (36%) | |
| 14 km | 86 (43%) | 113 (57%) | |
