Measuring differences and similarities in hospital caseloads: a conceptual and empirical analysis.

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OBJECTIVE. This article conceptually and empirically evaluates alternative index measures that have been used to distinguish among hospital caseloads. It introduces two new measures. DATA SOURCES/STUDY SETTING. The study relies on 1987 Medpar data, which provide a 100 percent sample of Medicare Part A claims for the calendar year. STUDY DESIGN. Descriptive statistics indicate the sensitivity of alternative caseload measures to hospital bed size, region, and urban/rural location. Multiple regression analysis then examines the ability of the caseload measures to distinguish among hospitals based on hospital- and area-specific characteristics. DATA COLLECTION/EXTRACTION METHODS. A provider level file containing the number of cases treated by each provider in each DRG was constructed from the Medpar data and merged with data from the American Hospital Association and the Area Resource File. PRINCIPAL FINDINGS. Different indexes purporting to measure hospital specialization are often evaluating very different aspects of the hospitals' caseloads. Prior work has indicated a specialization among hospitals during the period from 1980 to 1985. Replication of this work using other indexes could verify the increase in specialization and might provide a clearer picture of market or hospital characteristics associated with changing caseloads.

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