Comparing estimated resistance in retreatment cases in surveys from public sector only and surveys from public and private sectors. Estimates (solid colored lines) and variances (dotted lines) for retreatment cases based on public sector data only (red) and public and private sector data (green), assuming different fractions (kRN) of retreatment cases seek care in the public sector, of which 30% have MDR TB. The thick black line represents the actual underlying proportion of drug resistance among new cases. The top panels (a1-a4) shows Case 1 (described in the text) where 50 additional samples from the private sector are used to create an improved estimate, the bottom panels (b1-b4) shows Case 2 where the total sample is evenly split between public and private sectors.
Cohen et al. BMC Public Health 2010 10:355 doi:10.1186/1471-2458-10-355