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Table 4 Diarrhoeal incidence rates in intervention and non-intervention systems with Rate Ratio from Generalized Estimating Equation Poisson regression accounting for possible clustering within systems and within households.

From: Impact on diarrhoeal illness of a community educational intervention to improve drinking water quality in rural communities in Puerto Rico

Age group Intervention systems   Non-intervention systems   Relative risk Lower 95% CI Upper 95% CI
  N Attack rate (%) N Attack rate (%)    
All ages 1291 2.5 1211 3.6 0.588 0.291 1.186
< 5 years 61 3.3 70 8.6 0.382 0.077 1.895
5 to 15 years 202 3.0 200 4.5 0.657 0.228 1.891
> 15 years 1025 2.3 972 2.9 0.687 0.317 1.483