Figure 2From: Water and sewage systems, socio-demographics, and duration of residence associated with endemic intestinal infectious diseases: A cohort study Crude intestinal infectious disease incidence rates vs. age. Data from 1995 to 2003 inclusive: a) N = 7,017 physician visits in 189,234,765 person-days of observation (top). b) N = 180 hospitalizations in 194,552,383 person-days (bottom).Back to article page