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