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An Australian casemix classification for palliative care: technical development and results

Janette Green

Robert Gordon

Centre for Health Service Development, University of Wollongong, Wollongong

Objectives: To develop a palliative care casemix classification for use in all settings including hospital, hospice and home-based care. Sample: 3866 palliative care patients who, in a three-month period, had 4596 episodes of care provided by 58 palliative care services in Australia and New Zealand. Method: A detailed clinical and service utilization profile was collected on each patient with staff time and other resources measured on a daily basis. Each day of care was costed using actual cost data from each study site. Regression tree analysis was used to group episodes of care with similar costs and clinical characteristics. Results: In the resulting classification, the Australian National Sub-acute and Non-acute Patient (AN-SNAP) Classification Version 1, the branch for classifying inpatient palliative care episodes (including hospice care) has 11 classes and explains 20.98% of the variance in inpatient palliative care phase costs using trimmed data. There are 22 classes in the ambulatory palliative care branch that explains 17.14% variation in ambulatory phase cost using trimmed data. Discussion: The term ‘subacute’ is used in Australia to describe health care in which the goal — a change in functional status or improvement in quality of life — is a better predictor of the need for, and the cost of, care than the patient's underlying diagnosis. The results suggest that phase of care (stage of illness) is the best predictor of the cost of Australian palliative care. Other predictors of cost are functional status and age. In the ambulatory setting, symptom severity and the model of palliative care are also predictive of cost. These variables are used in the AN-SNAP Version 1 classification to create 33 palliative care classes. The classification has clinical meaning but the overall statistical performance is only moderate. The structure of the classification allows for it to be improved over time as models of palliative care service delivery develop.

Key Words: ambulatory care • case mix • casemix • classification • palliative care • stage of illness

Palliative Medicine, Vol. 18, No. 3, 217-226 (2004)
DOI: 10.1191/0269216304pm875oa


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