Ecological scatterplots show the relationship between HIV prevalence in our study sample of PWID, and the distribution or level of income for the 32 communes in Thai Nguyen, Vietnam.

<p>A, Crude GINI coefficient is shown along the X-axis. B, GINI coefficients adjusted with a first-order correction factor to account for variable and small sample sizes shown along the X-axis. C, median commune income is shown along the X-axis. Size of the circle represents weighting according to the total number of PWID enrolled from the commune.