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Standardised comparison of performance indicators in trauma - a new approach to case-mix variation.

Hollis, S. and Yates, D. W. and Woodford, M. and Foster, P. (1995) Standardised comparison of performance indicators in trauma - a new approach to case-mix variation. Journal of Trauma, 38 (5). pp. 763-766.

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Abstract

An institution's trauma survival rate can be compared with that predicted by TRISS using definitive outcome-based evaluation. This examines W, the difference between actual and predicted survival rates; Z, the statistical significance of this difference; and M, a measure of the similarity of injury severity mix to the prediction data base. However, it is possible for two institutions with the same survival rate within each band of injury severity to have very different W and Z scores whilst retaining a similar M score. Clearly this is unsatisfactory. A new statistic, Wsub s , is therefore proposed, which is standardized with respect to injury severity mix, producing more accurate comparisons between different institutions. Confidence intervals are used to graphically illustrate the magnitude of Wsub s , its direction, accuracy, and statistical significance. Data from the U.K. Major Trauma Outcome Study are used to demonstrate the calculations and presentation of Wsub s and its advantages.

Item Type: Article
Journal or Publication Title: Journal of Trauma
Subjects: Q Science > QA Mathematics
Departments:
ID Code: 19570
Deposited By: ep_ss_importer
Deposited On: 11 Nov 2008 09:29
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:32
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/19570

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