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Table 2 Sample size calculations for estimating the proportion of travelers with acute gastroenteritis due to norovirus

From: Estimating the incidence of norovirus acute gastroenteritis among US and European international travelers to areas of moderate to high risk of traveler’s diarrhea: a prospective cohort study protocol

Probability of Norovirus given Acute Gastroenteritis Probability of Acute Gastroenteritis
10% 20% 30% 40%
2.5% 250 499 744 991
5% 499 991 1477 1958
10% 991 1958 2904 3830
  1. Note: Assumptions: 1) Confidence Interval = 95%, 2) Precision = 1%, 3) Separate Regional Estimates Based on Study Site (European and United States), and 4) 30% Over-Enrollment to Account for Incomplete Follow-Up