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Marshfield Epidemiologic Study Area (MESA)


    Marshfield Epidemiologic Study Area (MESA)

Years of Data Collection


Sample Size

    MESA has approximately 85,000 residents, with about 19,000 living in the city of Marshfield and the rest living in rural areas – small towns, villages and countryside. The area has approximately 2,200 farms with a population of about 5,400. MESA is divided into two main regions. The largest region, called MESA Central, includes approximately 60,000 people in 14 ZIP code areas clustered around Marshfield Clinic-Marshfield Center. The remaining MESA residents live in a region called MESA North, which includes approximately 25,000 people in 10 ZIP code areas near Park Falls, Phillips and Ladysmith.

Geographic Location of Sample Subjects

    Northern and Central Wisconsin

Rationale for study

    The Marshfield Epidemiologic Study Area (MESA) is a geographic region defined by zip codes where the great majority of residents choose to receive medical care at Marshfield Clinic, its regional centers and affiliated hospitals. It is a unique resource for population-based health research when combined with health data from the Marshfield Clinic.