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Table 1 Minimum detectable relative risks for different scenarios of exposure prevalence

From: Piccolipiù, a multicenter birth cohort in Italy: protocol of the study

Exposure prevalence Relative risk Examples
5% 2.00 Association between maternal pre-pregnancy obesity and childhood obesity
10% 1.69 Association between maternal hypertension in pregnancy and asthma in childhood
25% 1.46 Association between lower socio-economic status and impaired cognitive development
50% 1.40 Association between gender and emergency department admittance for common diseases
  1. Legend: Relative risks estimated for a cohort of 2700 children with complete follow-up for different scenarios of exposure prevalence, considering an 80% power, an alpha error of 5% and a risk of the outcome of 10%.