• L Perimal-Lewis, J Y Li, P H Hakendorf, D I Ben-Tovim, S Qin, and C H Thompson.
• School of Computer Science, Engineering and Mathematics, Information, Science and Technology, Flinders University, Australia. lua.perimal-lewis@flinders.edu.au
• Intern Med J. 2013 Jun 1; 43 (6): 712-6.

BackgroundThe discrepancy between the number of admissions and the allocation of hospital beds means that many patients admitted under the care of a general medical service can be placed in other departments' wards. These patients are called 'outliers', and their outcomes are unknown.AimsTo examine the relation between the proportion of time each patient spent in their 'home ward' during an index admission and the outcomes of that hospital stay.MethodsData from Flinders Medical Centre's patient journey database were extracted and analysed. The analysis was carried out on the patient journeys of patients admitted under the general medicine units.ResultsOutlier patients' length of stay was significantly shorter than that of the inlier patients (110.7 h cf 141.9 h; P < 0.001).They had a reduced risk of readmission within 28 days of discharge from hospital. Outlier patients' discharge summaries were less likely to be completed within a week (64.3% cf 78.0%; P < 0.001). Being an outlier patient increased the risk-adjusted risk of in-hospital mortality by over 40%. Fifty per cent of deaths in the outlier group occurred within 48 h of admission. Outlier patients had spent longer in the emergency department waiting for a bed (6.3 h cf 5.3 h; P < 0.001) but duration of emergency department stay was not an independent predictor of mortality risk.ConclusionOutlier patients had significantly shorter length of stay in hospital but significantly greater in-patient death rates. Surviving outlier patients had lower rates of readmission but lower rates of discharge summary completion.© 2012 The Authors; Internal Medicine Journal © 2012 Royal Australasian College of Physicians.

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