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Table 1 Demographics of the population, by study group (n = 538)

From: Waterborne microbial risk assessment : a population-based dose-response function for Giardia spp. (E.MI.R.A study)

  Group 1 (n = 116) Group 2 (n = 100) Group 3 (n = 100) Group 4 (n = 222)
Sex ratio 1.04 0.79 0.87 1.05
Age structure (%)
< 15 years 27.6 20.0 26.0 31.5
15–59 64.6 59.0 61.0 58.6
>= 60 years 7.8 21.0 13.0 9.9