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This involves application of the Index of Medical Underservice (IMU) to data on a service area to obtain a score for the area. The IMU scale is from 0 to 100, where 0 represents completely underserved and 100 represents best served or least underserved. Under the established criteria, each service area found to have an IMU of 62 or less qualifies for designation of an MUA.

The IMU involves four variables - primary medical care physician-to-population ratio, infant mortality rate, percentage of the population with incomes below the poverty level, and percentage of the population over age 65. The value of each of these variables for the service area is converted to a partial score, according to established criteria; these four scores are summed to obtain the IMU score for the area.

Click on the map below to go to an enlarged PDF version. You must have Adobe Reader on you computer to view the map. A free of Reader is available for download at

This map is courtesy of the Wayne State University Center for Urban Studies/ Michigan Metropolitan Information Center
Official Census Bureau State Data Center Coordinating Agency.


Current & Newly-Indexed Tri-County MUA Tracts with HPSA-Designated Tracts Identified

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