BMJ 1995;311:1025 (14 October)

Letters

Differences in mortality after fracture of hip

EDITOR,--C R Packham1 suggests that case mix may have been responsible for the variation among hospitals in 90 day mortality after admission for fractured hip that we reported.2 The possibility that patients' characteristics may explain differences in outcome is the reason why a multivariate analysis was necessary. Clearly, such an analysis has to be limited to those factors for which information is available, and our prospective audit, like any other study, could not record every conceivable potentially explanatory factor. This was one of the main points that we addressed in our response to previous letters about our study.3

Nevertheless, we conducted fairly extensive interviews with patients in addition to extracting records from case notes and thus were able to enter a reasonably large number of variables into the logistic regression model. Specifically, these were age; sex; the prior activities of daily living score; the type of residence from which patients . . . [Full text of this article]


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