Study Design and Methodology

The Ashland Nyanza Health Study was a retrospective cohort study which attempted to recreate the population of children between the ages of 10 and 18 who resided in Ashland during the years 1965 to 1985.

The objective of the study was to determine and compare the incidence of cancer among exposed and non-exposed individuals of the study cohort (i.e., individuals who reported contact with the Nyanza site versus individuals who reported no contact with the site).

The cohort was restricted by age based on opportunity for past exposure. That is, the target study population consisted of Ashland children and young adults thought to have the most frequent contact with the Nyanza site and therefore the most opportunity for potential exposure to site contaminants.

Children younger than age ten were thought to not come in contact with the site as frequently as older children. By restricting the study to individuals who were aged 10 to 18 during the time period of interest (i.e., 1965 to 1985); the study targets those Ashland residents that had the greatest opportunities for exposure to the site.

see also:

Introduction to Ashland Nyanza Health Study Introduction to Ashland Nyanza Health Study
Introduction to Ashland Nyanza Health Study

Study Design and Methodology Nyanza - Study Design and Methodology
Nyanza - Study Design and Methodology

MA State Department of Health Report on Nyanza Nyanza - Official Report from Massachusetts Department of Health
Nyanza - Official Report from Massachusetts Department of Health