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Table 1 The probability* of the true population value of GAM exceeding the 10% threshold for different counts of GAM cases and different design effects in a 33 × 6 (33 clusters of 6 children) survey.

From: Interpreting results of cluster surveys in emergency settings: is the LQAS test the best option?

Observed GAM count GAM prevalence Probability of GAM exceeding 10% threshold, %
   DEFF** = 1 DEFF** = 1.1 DEFF** = 1.2 DEFF** = 1.3
14 7.1% 9.0% 10.0% 10.9% 11.9%
15 7.6% 13.2% 14.3% 15.4% 16.3%
16 8.1% 18.7% 19.9% 20.9% 21.8%
17 8.6% 25.6% 26.6% 27.5% 28.2%
18 9.1% 33.6% 34.4% 35.0% 35.5%
19 9.6% 42.5% 42.9% 43.2% 43.5%
20 10.1% 51.9% 51.8% 51.7% 51.6%
21 10.6% 61.0% 60.6% 60.2% 59.8%
22 11.1% 69.6% 68.9% 68.1% 67.5%
23 11.6% 77.1% 76.2% 75.3% 74.5%
  1. * Based on the one-sided t-test with 32 degrees of freedom
  2. ** Design effect