Perinatal Market Penetration Rate

Abstract
Very small babies born in tertiary centers fare better than outborn babies referred for tertiary care after birth. Viewing the 1001-1500 gm regional cohort of fetuses as a potential "market" for center delivery, and measuring a center''s penetration into this market, quantitates how well a center draws to itself these small, high-risk fetuses for delivery. An Illinois center''s annual penetration rate into its regional market for the years 1973-1983 is presented and significant increases are found. The penetration rates of nine Illinois perinatal centers are calculated and wide discrepancies are found. Defining a high-risk regional cohort as a market stresses a perinatal center''s obligation to its region. The penetration rate into a defined market measures how well a center fulfills this obligation.

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