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Table 2 Clustered lot quality assurance sampling plan used to evaluate yellow fever and measles vaccination coverage, Sierra Leone, 28–29 November 2009

From: Intervene before leaving: clustered lot quality assurance sampling to monitor vaccination coverage at health district level before the end of a yellow fever and measles vaccination campaign in Sierra Leone in 2009

N d %LT %UT Clusterskxn SD range % Alpha range % Beta range
50 4 80 95 5x10 0-0.1 2-5 10-19
50 7 75 90 5x10 0-0.1 4-8 12-19
100 15 75 90 10x10 0-0.1 1-3 4-12
150 25 75 90 15x10 0-0.1 1-4 1-4
  1. N: lot sample size; d: decision value; LT: lower threshold; UT: upper threshold; k: number of clusters; n: cluster sample size; SD: standard deviation.