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. 1994 Oct;10(5):625-32.
doi: 10.1007/BF01719583.

Relationship between severity, costs and claims of hospitalized patients using the Severity of Illness Index

M A Asenjo  1 , L Baré, J M Bayas, A Prat, R Lledó, J Grau, L Salleras
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Relationship between severity, costs and claims of hospitalized patients using the Severity of Illness Index

M A Asenjo et al. Eur J Epidemiol. 1994 Oct.

Abstract

The results of the prospective application of Horn's 'Severity of Illness Index' in a teaching hospital during 1987, 1989, and 1990 constitute the basis of the present report. The average overall severity of illness scores for the three years were 1.42 in 1987, 1.65 in 1989, and 1.46 in 1990. Most of the processes evaluated in the three periods showed an overall distribution among severity levels 1 and 2, both overall and when the seven dimensions of the severity of illness index were analyzed. A statistically significant correlation between the overall severity of illness and average length of stay was found for patients in 1989 and 1990. The length of stay differed significantly in the different severity levels. When the four levels of the seven dimensions of the severity of illness index for 1987, 1989, and 1990 were compared, it was observed that figures were not uniformly distributed. There was a statistically significant association between severity of illness for hospital service and pharmacy charges per hospital stay for both 1989 and 1990, as well as a statistically significant inverse relationship between severity of illness and the number of claims per hospital service in both periods of time. Case-mix methods that account for the severity of patients constitute a useful indicator of quality for the management of different hospital services and of the hospital as a whole.

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