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Joanna Coast a Department of Social Medicine, University of
Bristol, Bristol BS8 2PR, b Hospital-at-Home, Downend
Clinic, Bristol BS16 5TW, c Day Hospital, Frenchay Hospital, Bristol BS16 1LE
Correspondence to: Joanna Coast
jo.coast{at}bristol.ac.uk
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Abstract |
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Objective: To compare, from the viewpoints of the NHS
and social services and of patients, the costs associated with early
discharge to a hospital at home scheme and those associated with
continued care in an acute hospital.
Design: Cost minimisation analysis.
Setting: Acute hospital wards and the community in
the north of Bristol (population about 224 000).
Subjects: 241 hospitalised but medically stable
elderly patients who fulfilled the criteria for early discharge to a
hospital at home scheme and who consented to participate.
Main outcome measures: Costs to the NHS, social
services, and patients over the 3 months after randomisation.
Results: The mean cost for hospital at home
patients over the 3 months was £2516, whereas that for hospital
patients was £3292. Under all the assumptions used in the sensitivity
analysis, the cost of hospital at home care was less than that of
hospital care. Only when hospital costs were assumed to be less than
50% of those used in the initial analysis was the difference
equivocal.
Conclusions: The hospital at home scheme is less
costly than care in the acute hospital. These results may be
generalisable to schemes of similar size and scope, operating in a
similar context of rising acute admissions.
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Key messages
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Introduction |
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Hospital at home is a generic term referring to home based nursing and rehabilitation services aiming to prevent admission or to facilitate early discharge from care in an acute hospital. Hospital at home schemes are often thought to be a cost effective alternative to acute hospital care,1-3 but few published evaluations exist. Some studies have shown that early discharge schemes are viable in terms of cost, 4-6 but a recent study has shown increased costs.7 To date, however, no economic evaluations have been published in which cost data have been collected alongside a randomised controlled trial evaluating the effectiveness of hospital at home. Studies have generally concentrated on costs of secondary health care, ignoring costs incurred by the patient, social services, and even primary care. Furthermore, studies have not, generally, followed patients for an equivalent time from the baseline assessment (instead, following patients until discharge) and have not considered whether differences in costs arise after discharge.
We compared standard continued acute hospital care with early discharge to hospital at home, for elderly patients currently in the acute hospital but requiring only nursing or rehabilitative care, or both. The comparison is particularly apt in the current context of rising emergency admissions to hospital, as a perceived aim of hospital at home is to ensure that hospital resources are focused on patients who cannot easily be managed in the community.
The study was carried out in parallel with a pragmatic randomised controlled trial comparing the effectiveness and acceptability of the two alternatives, which concluded that the two forms of care had similar outcomes in terms of mortality, functional outcome, quality of life, and satisfaction with care.8
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Methods |
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The economic evaluation compared continued care in an acute hospital with early discharge to hospital at home for patients who had been admitted to the specialties of general medicine, care of the elderly, general surgery, and orthopaedics and who had potential for a good rehabilitative outcome. Patients randomised to the hospital arm received routine hospital care with discharge at the usual time. To ensure that the team operated as close to its capacity as possible, for every patient randomised to hospital care, two patients were randomised to hospital at home. Patients randomised to hospital at home received early discharge with home based rehabilitative care between 8 30 am and 11 pm provided by a team of two nurses (one G grade, one E grade), a physiotherapist (senior 1, 0.8 whole time equivalent), an occupational therapist (senior 1, 0.5 whole time equivalent), and three support workers (B grade auxilliary, flexible hours). Discharge from both hospital and hospital at home occurred when the patient could be managed by routine community services.
The economic evaluation was conducted from two main viewpoints: a combined NHS and social services viewpoint, and a patient viewpoint. The NHS and social services viewpoint is presented separately, except in the analysis of aids and adaptations (which are combined because patients could not reliably distinguish the providing service).
The appropriate form of economic evaluation was determined by the results of the associated trial.9 Although provision was made in the study for conducting alternative forms of evaluation, the appropriate form is a cost minimisation analysis, given the extremely similar results in terms of effectiveness and acceptability.8
The analysis was conducted in the context of rising emergency admissions in a hospital nearing capacity. Average costs were used to value hospital care, as these approximate the costs that would be associated with the provision of new hospital services in the long term. In this context, using short run variable costs to approximate marginal savings in hospital use of resources (which could potentially be recouped to pay for hospital at home) is not appropriate. Using long run costs may also be more meaningful for informing national policy.10
Collection of resource use data
Data on use of resources were obtained for each patient for
the three months following randomisation (table
1).
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Valuation of resource use data
Sources of valuations for individual items of resource use
are shown in table 2.
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that items were used for one year and then
discarded. An assumption at the other extreme was used for the
sensitivity analysis (see below).
The NHS mileage rate at the time of the study was used to value all
travel for the hospital at home team. Patients were asked to provide
information about the cost of any purchases, services, or contributions
to social services.
Sensitivity analysis
Hospital resources released for care of other patients may
be less than the long run average cost when patients are nearing the
end of their hospital stay and therefore require less intensive nursing
support. Sensitivity analyses assumed that resources released would be
either 75% or 50% of the average cost.
Statistical analysis
The sample size was not determined for the economic
evaluation specifically,8 and the aim was to collect data
for all patients included in the study. A variety of data sources was
used to acquire information about resource use, and relatively few
patients had a complete set of such data. Hence, mean costs for each
item of resource use were calculated and then aggregated to estimate
the total cost per patient. Statistical testing was therefore not
possible at the level of total resource use per patient. The mean is
presented for descriptive purposes; although the resource use data are
highly positively skewed, provision of information about median
resource use and costs (which were often zero) is unhelpful for service
planners who require estimates of total costs associated with each
scheme. For such skewed data, however, care must be exercised in
interpreting standard deviations in particular.
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Results |
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All 241 patients participating in the associated randomised controlled trial were included in this economic evaluation.8 Table 3 shows the time spent on different activities by the hospital at home team during one month, the associated cost per hour of client contact, and costs used in the sensitivity analysis.
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The main measures of use of physical resources associated with both forms of care are presented in table 4. Table 5 shows the results of combining resource use with information on valuation, in terms of mean cost per patient, and also the total costs associated with particular viewpoints. Hospital at home costs were lower than costs of continued hospital care from both the NHS and social services viewpoint and the patient's viewpoint.
Table 6 shows the results of the sensitivity analysis. Neither altering the valuation of aids and adaptations nor including travel costs for community and social service staff made large differences to the results. The impact of assuming a greater utilisation of the hospital at home team (and hence a lower cost per hour of client contact) was inevitably concentrated in the hospital at home arm: relative to the initial results, the impact of this change was to make hospital at home seem even less costly. The greatest impact on results occurred when changes to hospital costs were assumed. When hospital costs were taken as 75% of the original costs, hospital at home continues to be less costly, but if hospital costs were taken as 50% of original costs, the two options incurred similar total costs.
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Discussion |
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This economic evaluation comparing early discharge to hospital at home with continued care in an acute hospital followed by routine discharge has, under all assumptions used, found that the cost of hospital at home care is less than that of hospital care over the 3 months from randomisation. Only when hospital costs were assumed to be less than 50% of the costs originally used was the comparison more equivocal.
Costs of the schemes and impacts on budgets
The initial analysis calculated the mean cost per hospital
patient as £3292 and that for hospital at home patients as £2516.
This implies a reduction in cost of around £750 per patient with early
discharge. For every £10 000 spent, routine hospital care could be
provided for only three patients, whereas early discharge to care in
the hospital at home scheme could be provided for four patients.
Limitations of the study
Inevitably this study has limitations. Different data
sources were used to estimate quantities of particular items of
resource use. For each source, data were available for different
numbers of patients (and different patients). To maximise data
available for each item of resource use, each item was analysed
separately, with aggregation of the mean cost per patient for
individual items to estimate total mean cost per patient only at the
end of the analysis. This rules out confidence intervals for overall
estimates of resource use and statistical analysis of these overall
estimates. Basing costs on patients for whom complete data sets were
available would have reduced the sample size. As the study was
randomised, there is no reason to believe that problems with data
availability were more important in one arm of the trial.
Start-up costs and cost of informal care
The hospital at home scheme examined in this trial had been
operating for three months before the trial began. The steepest part of
the team's learning curve was therefore avoided, but costs associated
with hospital at home would be expected to reduce further over time.
Particularly in the first year of the study, the hospital at home
coordinator spent considerable time publicising the scheme and
recruiting patients. The cost per patient associated with the early
days of a scheme is likely to be much higher than that associated with
an established scheme.
Generalisability of findings
The inconsistency in the findings of recent economic
evaluations comparing hospital at home schemes with acute hospital care
in the United Kingdom
7 13
may result from differences in
the type, size, scope, and organisation of schemes; the context in
which the service is operating (including differences in costs of the
routine care to which hospital at home is being compared); and
utilisation of the scheme. Our results are most likely to be
generalisable to schemes of similar organisation, size, and scope. The
context of rising emergency admissions in which this scheme is
operating is also of importance in assessing whether the costs
described here are applicable in other situations.
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Acknowledgments |
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We thank the staff of the Frenchay Healthcare Trust and Avon Orthopaedic Centre at Southmead Hospital for their cooperation with the study, and Maggie Somerset, Margaret Evans, and Sara Brookes for assistance with data collection.
Contributors: JC led the design of the economic evaluation, led in the development of data collection instruments for the economic evaluation, analysed the economic data, led the writing of the paper. SHR contributed to the design of the economic evaluation and assisted in the development of data collection instruments, collected the economic data, and contributed to the writing of the paper. TJP contributed to the design of the economic evaluation and data analysis and to writing the paper. DJG participated in the design of the economic evaluation and data analysis and contributed to writing the paper. JP and MAD participated in the design of the economic evaluation and conributed to the interpretation of data and writing the paper.
Funding: South and West National Health Service Research and Development Directorate. The hospital at home team was funded by Avon Health Authority. The Department of Social Medicine at the University of Bristol is part of the MRC Health Services Research Collaboration.
Conflict of interest: MAD was part of the hospital at home team being evaluated.
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References |
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(Accepted 19 February 1998)