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Figure 1 | BMC Public Health

Figure 1

From: Water and sewage systems, socio-demographics, and duration of residence associated with endemic intestinal infectious diseases: A cohort study

Figure 1

Maps showing geographic distributions of the water and sewage systems. Data for parcels in a mixed rural-urban community in the Metro Vancouver area of Canada, on July 1 1999, the mid-point of the study period (of a total of 29,458 parcels). Uncolored areas are parcels not included in the study, either because they were outside the Township or did not house a study subject on that date (e.g., industrial, commercial or park land, or vacant property).

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