1. Community-level income inequality and HIV prevalence in injection drug users in Thai Nguyen, Viet Nam Travis Lim, Vivian Go, Tran Viet Ha, Nguyen Le Minh, Chu Viet Anh, Wendy Davis, and Vu Minh Quan This work was supported by a generous grant from NIDA (NIDA 1 R01 DA022962-01.)

2. Country-level ecologic relationship between HIV prevalence vs. income inequality (in general population) 2 © 2009, Johns Hopkins University. All rights reserved. Source: Fox (2010), Public Health Reports, 125(Suppl4):16-24

3. Community-level ecologic relationship between HIV infection in IDU, vs. relative or absolute community income 3 © 2009, Johns Hopkins University. All rights reserved. HIV prevalence among IDU 0 0.2 0.4 0.6 HIV prevalence among IDU 0 0.2 0.4 0.6 GINI Coefficient 0.2 0.3 0.4 0.5 Community members median monthly income (USD) 50 100 150 Figure 1. Ecological scatterplot of 32 Thai Nguyen communes, weighted by number of IDU. ρ = 0.53 ( p = 0.002) Figure 3. Ecological scatterplot of 32 communes, weighted by number of IDU. ρ = -0.45 ( p =0.01)

4. Regression of sample HIV prevalence on income inequality controlling for median community income 4 © 2009, Johns Hopkins University. All rights reserved. PredictorCoefficientp value95% CI, lower / upper GINI coefficient (/10)0.0820.0080.0230.141 Median monthly income, USD (*10) -0.0180.023-0.033-0.0026 Urban (vs. rural)-0.0620.09-0.1510.361 PredictorCoefficientp value95% CI, lower / upper GINI coefficient (/10)0.0360.0060.0110.061 Median monthly income, USD (*10) 0.0120.053-0.0010.025 GINI-median income interaction term -0.0350.027-0.066-0.004 Urban (vs. rural)-0.0470.181-1.970.075 Table 2. OLS regression of HIV prevalence with GINI-income interaction Table 1. Results of OLS regression of sample HIV prevalence in IDU