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Table 6 Recommendations to spatially assign the available CBP data to the subjects in epidemiological studies

From: The assessment of population exposure to chlorination by-products: a study on the influence of the water distribution system

Degree of spatial variability of CBP levels in the system

Number of CBP data available for the distribution system under study

 

1 site/sub-system

> 1 site/sub-system

> 1 site/distribution system (but not sampling site in each sub-system)

High

Use of the sampling site in sub-system

The closest sampling site from the subject's residence

Determination of comparable sub-systems. Use of the sampling site located in sub-system with the most similar characteristics.

Low

Use of the sampling site in sub-system

Average of all sampling sites or average of the two closest sites from the subject's residence

Similar to above or average of all sampling sites