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Table 2 Sample size for precise estimate at state level using a priori guess

From: Nationwide cross-sectional survey of schistosomiasis and soil-transmitted helminthiasis in Sudan: study protocol

State Presumed prevalence Presumed k
(the coefficient of between-cluster variation)
Precision Cluster size Sample size Number of schools
State 1 7% 0.5 20% 60 2693 45
State 2 20% 0.5 20% 60 1801 30
State 3 5% 0.5 20% 60 3241 54
State 4 30% 0.5 20% 60 1641 27