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Hospital quality indicators are not unidimensional: A reanalysis of Lieberthal and Comer

Objective: To evaluate the dimensionality of hospital quality indicators treated as unidimensional in a prior publication.

Data Source/Study Design: Pooled crosssectional 20102011 Hospital Compare data (10/1/10 and 10/1/11 archives) and the 2012 American Hospital Association Annual Survey.

Data Extraction: We used 71 indicators of structure, process, and outcomes of hospital care in a principal component analysis of Ridit scores to evaluate the dimensionality of the indicators. We conducted an exploratory factor analysis using only the indicators in the Centers for Medicare & Medicaid Services' Hospital ValueBased Purchasing.

Principal Findings: There were four underlying dimensions of hospital quality: patient experience, mortality, and two clinical process dimensions.

Conclusions: Hospital quality should be measured using a variety of indicators reflecting different dimensions of quality. Treating hospital quality as unidimensional leads to erroneous conclusions about the performance of different hospitals.

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