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Table 2 Number of measles case-patients required to retrospectively estimate measles CFR based on expected CFR and desired precision

From: Challenges in measuring measles case fatality ratios in settings without vital registration

  95% Confidence Intervals
Expected CFR ± 0.5% ± 1% ± 2% ± 3% ± 4% ± 5%
1% 1519      
2% 3003 752     
3% 4452 1117 279    
4% 5866 1473 369 164   
5% 7246 1821 456 203 114  
10% 13641 3445 864 384 216 138
15% 19215 4874 1223 544 306 196
20% 23995 6109 1534 682 384 246
  1. Note: Sample sizes will need to be adjusted based on design effect and response rate