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Table 2 Six possible phase I stratification schemes that use readily-available group-level information collected by the current M&E systems in Malawi

From: Strategies for monitoring and evaluation of resource-limited national antiretroviral therapy programs: the two-phase design

Design #1 Private clinic     
  No Yes     
 Non-negative status 64,651 2,095     
 Negative status 15,839 302     
Design #2 Year of registration/Private clinic
  2005/No 2005/Yes 2006/No 2006/Yes 2007/No 2007/Yes
 Non-negative status 11,991 247 22,887 1,006 29,773 842
 Negative status 3,492 22 6,104 167 6,333 113
Design #3 Percent WHO stage 1 or 2     
  ≤5% >5%     
 Non-negative status 50,570 16,176     
 Negative status 13,191 2,950     
Design #4 Average age, years    
  ≤35 36-40 >40    
 Non-negative status 12,954 51,959 1,833    
 Negative status 3,570 12,239 332    
Design #5 Percent female
  0% 1-40% 41-50% 51-60% 60-99% 100%
 Non-negative status 189 3,360 4,766 19,255 38,949 227
 Negative status 20 630 1,144 5,248 9,081 18
Design #6 Percent WHO stage 1 or 2/Private clinic   
  ≤5%/No >5%/No ≤5%/Yes >5%/Yes   
 Non-negative status 49,160 15,491 1,410 685   
 Negative status 12,796 2,863 215 87