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Percentage Variance in the Odds of Testing Positive for HIV by Geographical Unit Among 9077 People Who Inject Drugs: 2009 National HIV Behavioral Surveillance System, United States
| Geographical Units | Percentage Variance in HIV Apportioned to Geographical Units |
| Zip code | 6.5 |
| County | 2.3 |
| Metropolitan statistical area | 9.8 |
| Total | 18.6 |
