Figure 4.

Proportion of all smear positive TB patients with successful TB treatment outcomes stratified by province, tracer vs. non-tracer subdistricts, Q1 2007-Q1 2009, South Africa. A significant difference was detected in the proportion of treatment success in 1/9 provinces in South Africa in tracer subdistricts (solid line) compared to non-tracer subdistricts (dashed line). The p-value reported for each graph represents the significance of the tracer status by time interaction term to assess the change in linear trend of each treatment outcome comparing tracer versus non-tracer subdistricts over time. The y-axis representations for percentages of treatment success were not standardized on a 0-100% scale to allow for better visualization of the percent change from Q1 2007 to the end of the evaluation period in Q1 2009.