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Table 1 Power to detect differences between the two intervention arms at a significance level of 5%, assuming a coefficient of variation of 0.2

From: The Lake Victoria island intervention study on worms and allergy-related diseases (LaVIISWA): study protocol for a randomised controlled trial

Outcome Sample size per arm Prevalence in standard intervention arm Risk ratio for intervention effect
1.4 1.5 1.6
Wheeze within last 12 months in participants ≥5-years-old 1,300 10% 67% 83% 92%
Atopy: positive skin prick test in participants ≥1-year-old 1,560 10% 72% 87% 95%
Atopy: allergen-specific immunoglobulin E concentration >0.35 kUA/L in participants ≥1-year-old 1,560 10% 72% 87% 95%