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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