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Patient related factors in frequent readmissions: the influence of condition, access to services and patient choice
© Kirby et al; licensee BioMed Central Ltd. 2010
Received: 19 November 2009
Accepted: 21 July 2010
Published: 21 July 2010
People use emergency department services for a wide variety of health complaints, many of which could be handled outside hospitals. Many frequent readmissions are due to problems with chronic disease and are preventable. We postulated that patient related factors such as the type of condition, demographic factors, access to alternative services outside hospitals and patient preference for hospital or non-hospital services would influence readmissions for chronic disease. This study aimed to explore the link between frequent readmissions in chronic disease and these patient related factors.
A retrospective analysis was performed on emergency department data collected from a regional hospital in NSW Australia in 2008. Frequently readmitted patients were defined as those with three or more admissions in a year. Clinical, service usage and demographic patient characteristics were examined for their influence on readmissions using multivariate analysis.
The emergency department received about 20,000 presentations a year involving some 16,000 patients. Most patients (80%) presented only once. In 2008 one hundred and forty four patients were readmitted three or more times in a year. About 20% of all presentations resulted in an admission. Frequently readmitted patients were more likely to be older, have an urgent Triage classification, present with an unplanned returned visit and have a diagnosis of neurosis, chronic obstructive pulmonary disease, dyspnoea or chronic heart failure. The chronic ambulatory care sensitive conditions were strongly associated with frequent readmissions. Frequent readmissions were unrelated to gender, time, day or season of presentation or country of birth.
Multivariate analysis of routinely collected hospital data identified that the factors associated with frequent readmission include the type of condition, urgency, unplanned return visit and age. Interventions to improve patient uptake of chronic disease management services and improving the availability of alternative non-hospital services should reduce the readmission rate in chronic disease patients.
Emergency departments aim to provide treatment for more urgent and serious conditions. In Australia, the role of emergency departments has been specified as "prevention, diagnosis and management of acute and urgent aspects of illness and injury affecting patients of all age groups with a full spectrum of undifferentiated physical and behavioural disorders". However, many people who access emergency departments have complex social needs as well as a clinical condition requiring treatment [2–4]. Emergency departments across the world are reporting serious overcrowding resulting in lengthy waits which impair the quality of care and patient outcomes [5–7]. Investigation of patient profiles and the reasons behind the choice of emergency department services by frequent attenders and frequently readmitted patients is vital to guide the development of policy and design of interventions to address more appropriate patient management strategies and to prevent overcrowding .
Overcrowding of emergency departments has spawned a plethora of research on frequent emergency department users. Byrne et al  reported that frequent emergency department users were more likely to be males from low socioeconomic backgrounds with severe psychosocial problems who have a high morbidity and mortality. There have been similar findings from researchers in the UK [9–12], Canada [12, 13], Sweden [14–16], USA [17–25], Italy , Taiwan [27, 28] and Australia [29, 30].
Frequently readmissions, however, have received less research attention. The Patients At Risk of Readmission (PARR) tool, used extensively in the UK for identification of patients for case management to prevent readmissions, [31, 32] indicates that age, sex, ethnicity, number of previous admissions, and clinical condition are associated with readmissions. Howell et al  in a 2009 study in Australia identified age, co-morbidities, economic disadvantage, number of previous admissions as risk factors for frequent readmissions through a statistical algorithm derived from inpatient data. The Australian model was only moderately successful because of the relatively high number of false negatives.
Andersen's model of health service utilisation [34–36] provides a theoretical framework for thinking about why patients are frequently readmitted. This model postulates that health service utilisation is dependent on a range of factors such as the environment, population characteristics and health behaviours resulting in outcomes such as perceived health status, evaluated health status and consumer satisfaction. The environment includes available services and access issues. Population characteristics include demographic details, age, gender, cultural background, needs and resources. Health behaviours are influenced by personal attitudes and beliefs. Identifying the clinical, service utilisation details and demographic patient characteristics available from hospital data can identify risk factors for frequent readmissions and thereby help to develop strategies to divert these patients away from hospitals where clinically possible. The direct application of this model to emergency department utilisation summarised by Padgett et al [37, 38], who suggests that only about 15% of emergency visits in the USA are for life threatening reasons and that poor mental health, anxiety about health combined with symptoms and injury influence people to decide to use the emergency department.
How important is access to primary care in readmissions? Hospitalisations for ambulatory care sensitive (ACS) conditions is used an outcome indicator for access to primary care . It is acknowledged that treatment of ACS conditions outside hospitals, including chronic disease, reduces hospitalisations . It would be expected that ACS conditions would contribute to frequent readmissions in areas with limited access to primary care services.
The problem that a small number of emergency department users account for a disproportionate use of scarce resources has been reported since the 1980s [41, 42] and continues to plague the health system . An Australian survey of emergency departments indicated that patients awaiting admission are a major contributing factor in emergency department overcrowding . Two Australian States, NSW and Victoria, report diversion of chronic disease patients to chronic disease management services, including those provided by primary care, can reduce readmission rates [25, 45].
We know little about the reasons behind the choice of emergency department services over other alternative medical services in the community. However, studies in NSW Australia have reported that patients came to the emergency department because they thought their condition warranted urgent services, with access to a doctor and tests or x-rays done in the same place but there was a mismatch between the views of clinicians and patients [46, 47]. In a qualitative study performed in the USA , patients reported that they were unable to obtain an appointment with a primary care provider; were referred by the staff to be evaluated in the emergency department; and it took less of their time to be seen in the emergency department than it did to contact their primary care provider, only to then be told to go to the emergency department.
Fulde and Duffy argued that patients who present frequently to emergency departments are a vulnerable and marginalised group perceived as not looking after themselves. Padgett et al  suggest that the emergency department is the "least appropriate setting for treating multiple co-morbidities". These authors also reported that people who feel powerless and isolated tend to be high emergency department users.
Hong et al  suggest that we need a radical paradigm shift to legitimise the role of emergency departments to include primary care services for those people on the lower end of the socioeconomic scale who tend not to have a primary care provider in the community. The counter opinion would be to restrict the role of emergency departments and to increase the availability of alternative primary care services and to thereby reduce emergency department overcrowding.
This research analysed emergency department data routinely collected by hospitals in the state of NSW, Australia, to identify patient related factors associated with three or more admissions a year and with admission for ACS conditions. The analysis was designed to answer questions about the impact on frequent readmissions of three sets of variables: demographic, clinical and arrival times and dates. The answers provide a basis for exploring the reasons underlying frequent readmissions. The research sets the scene for further examination of the reasons why people with chronic conditions are repeatedly admitted to hospital rather than seeking chronic disease management services.
Study design and site
In this study, we analysed 2008 data from the Emergency Department Information System collected at a regional hospital. The University of Wollongong/South Eastern Sydney Illawarra Health Service Medical Human Research Ethics Committee approved the research study (approval HE07/271). All patient data were de-identified. The study was carried out in a one hundred and fifty bed regional hospital in south eastern Australia which is part of a network with a major teaching and referral hospital. The hospital, funded by the State and Commonwealth Government, is located in a coastal regional urban area with a feeder population of around 100,000.
All statistical analyses were performed using SPSS statistical software (Version18; SPSS, Chicago, Illinois, USA). Two-sided P values of less than 0.05 were considered statistically significant.
The original variables were: patient identifier number, age, gender, date and time of arrival, country of birth, ICD 9 diagnosis, level of urgency based on the Australian Triage Classification , type of visit and mode of separation (treated in emergency or admitted). Type of visit is a local code referring to the type of emergency presentation: normal, planned return and unplanned return within 28 days of the original presentation. Each patient presentation was accorded one primary ICD 9 diagnosis based on the major reason for the presentation. Date and time of arrival variables were converted into hour, day and season of arrival.
The data was analysed either from the perspective of presentations in row-for-each-presentation format or from the perspective of patients in a row-for-each-patient format with nested data for each patient. The primary research question to uncover the patient characteristics associated with frequent readmissions required the row-for-each-patient format. However, preliminary univariate analysis was performed on the row-for-each-presentation format on the variables for which there were different or potentially different, values for each presentation: hour, day and season of arrival; urgency; unplanned return visit and diagnosis. Univariate analysis was also performed with the variables which were constant for each presentation (age, gender and country of birth).
Primary outcome variable
The primary outcome variable was a binary variable of the number of admissions set with a cut off point at three or more admissions denoting frequent readmissions. Presenting patients judged to have conditions warranting admissions may be either admitted to the study hospital or to another hospital in the network if the bed supply is inadequate. All admissions, including those for which patients were placed in a bed in another hospital, were included in the sample. The number of admissions variable was obtained by separating the presentations for patients admitted, converting to the row-for-each-patient format and merging the admissions variable in to the main file.
Regression models and manipulation of predictor variables
Two logistic regression models for multivariate analysis were constructed with the binary dependent variable. The independent variables were transformed by counting the number of occurrences in the nested variables for each patient and dividing by the total number of presentations for that patient resulting in a variable of the proportion of occurrences and used in the multivariate analysis. As the values in the proportion variables ranged from zero to one, they were treated as continuous covariates. The independent diagnosis variables included the proportion of the most common ICD 9 diagnosis codes for presentations resulting in frequent readmissions: neurosis, chronic heart failure, chronic obstructive pulmonary disease (COPD), dyspnoeas and chest pain.
In the second logistic regression model was created to determine the impact of diagnoses which are deemed suitable for non-hospital services. Ambulatory care sensitive conditions are defined as those which hospitalisation is considered potentially avoidable through preventive care and early disease management, usually delivered in an ambulatory setting, such as primary health care (for example by general practitioners or community health centres). For the second logistic regression model, the independent continuous proportion-of-diagnoses variables based on the ACS groupings: rapid onset conditions and chronic conditions . were substituted for the continuous ICD 9 diagnoses proportion variables in the first model.
Logistic regression was considered the best option for analysis of the possible predictor variables because the dependent variable demonstrated Poisson distribution, with the variance higher than the mean, rendering linear regression models inappropriate [51, 52]. However, there has been debate in the literature about the impact of intra-patient variability in emergency department presentations on the choice of statistical analysis. This has led to questioning of the appropriateness of logistic regression and the proposition that negative binomial regression should be used [53, 54]. The results of the logistic regression were therefore checked against those of negative binomial regression. A backward elimination approach was adopted in the interest of achieving a parsimonious model [55, 56]. The categorical variables, male gender and born in Australia both met the criterion of a minimum of ten cases in each category.
Univariate analysis of patient characteristics comparing the general patient population with frequently readmitted patients 2008
All patients (n = 15,806)
Patients admitted = >3 times (n = 144) 1% of all patients
48% p < 0.051
Mean age (SD, range)
39 (26, 1-106)
66 (21, 2-96) p < 0.05
Born outside Australia
27% p < 0.051
Univariate analysis independent variables in the general presenting population compared to presentations resulting in frequent readmissions 2008.
General presenting population N = 21956
Presentations resulting in frequently readmissions N = 227
ICD9 diagnostic code 2
Dyspnoeas (ICD 78609)
15.9% p < 0.013
Neurotic disorder (ICD 3079)
10.6% p < 0.01
Chest pain (ICD 78650)
9.7% p < 0.01
Chronic obstructive pulmonary disease (ICD 496)
7% p < 0.01
Congestive heart failure (ICD 4280)
2.6% p < 0.01
All other ICD codes
54.2% p < 0.01
Urgent (Triage 1 & 2)
15.4% p < 0.01
Unplanned return visit
8.8% p < 0.01
Season of arrival
12.3% p < 0.01
Day of arrival
Time of arrival
Ambulatory Care Sensitive Conditions 4
ACS rapid onset
7.5% P < 0.01
87.7% P < 0.01
Of the seasonal variables, only in summer was there a significant difference between the two groups. There were no differences observed in time or day of arrival.
Odds ratio and confidence limits for the variables having a significant impact on frequent readmissions in model one five most common ICD 9 diagnoses, results from logistic regression backwards elimination.
95% Confidence Interval for odds ratio
Proportion of urgent (Triage categories 1 and 2)
Proportion of neuroses (ICD 9 code 3079)
Proportion of congestive heart failure (ICD 9 code 4280)
Proportion of chronic obstructive pulmonary disease (ICD 9 code 496)
Proportion of dyspnoeas (ICD 9 code 78609)
Proportion of unplanned return visits within 28 days of previous visit
Odds ratio and confidence limits for the variables having a significant impact on frequent readmissions in model two ambulatory care sensitive conditions, results from logistic regression backwards elimination.
95% Confidence Interval for odds ratio
Proportion urgent (Triage 1 & 2)
Proportion unplanned return visits within 28 days of previous visit
Proportion ACS Chronic conditions
The majority of presentations to the emergency department were by patients who had a single presentation in the year. The patients under investigation in this study were the one hundred and forty four frequently readmitted patients who had three or more admissions in a year. The univariate analysis showed significant differences in all the independent variables except the seasons of autumn, winter and spring and time and day of arrival. However, the multivariate analysis identified age, chronic conditions of neurosis, COPD, dyspnoeas and chronic heart failure, ACS chronic conditions, urgency and unplanned return visit as being associated with frequent readmissions. The study highlights the advantage of the multivariate analysis using the patient rather than presentation perspective to separate factors important in frequent readmissions.
Using the framework of Andersen's model of health service utilisation, the results can be considered in terms of patient demographics, clinical significance, access to services and individual patient preferences. The finding that age significantly influenced frequent readmissions is in line with other studies [31–33] These studies also reported that other demographic factors, sex and ethnicity, are associated with readmissions. However, there was no discernible sex difference, nor was there a difference between Australian born and those born outside Australia, in our study.
The type of condition is important in readmissions. Our model looked specifically at the most common conditions in presentations by patients admitted to a hospital bed. The diagnoses of neurosis, COPD, dyspnoeas and chronic heart failure, all serious conditions, were associated with frequent readmissions. Chest pain in our model was not associated with frequent readmissions. Although the regression models did not include a variable for severity of illness per se, other variables point to severity. The triage level specifically indicates urgency and more urgent conditions are generally more severe.
Unplanned return visits within 28 days of the previous visit for the same condition are reported by all public hospitals on a monthly basis to the NSW Department of Health. This indicator is considered to be important in assessing the quality of hospital care  on the basis that the underlying reason for the return visit may be related to premature discharge. Although the incidence of unplanned return visits is low, this is a predictor of frequent readmission and therefore worthy of further detailed investigation. An early warning system to flag unplanned return visits would assist in addressing their needs in a more timely way and reducing the burden on emergency services. Our findings in relation to unplanned return visits are in line with those reported for a US study on the Triage Risk Screening Tool .
The finding that frequent readmissions are associated with diagnoses of COPD, dyspnoeas and chronic heart failure is consistent with the notion that patients experiencing the symptoms associated with these conditions are more likely to believe their condition is serious enough for them to choose hospital care rather than primary care outside the hospital setting.
Seasonal variations in arrivals might have been expected because of the differences in temperature influencing the incidence of respiratory exacerbations. The fact that there were no seasonal variations is difficult to explain.
Patients with ACS chronic conditions were significantly more likely to be frequent readmissions. This finding could mean that access to primary care services for preventable conditions (immunisation and nutritional interventions) and rapid onset ACS conditions is adequate and access to chronic disease management services is not. Alternatively, the findings could indicate that patients are choosing hospital services over primary care services for chronic disease management.
Frequent readmissions for neurosis might be associated with reduced access to community based mental health services in the area. Another interpretation of this finding is that patients are voting with their feet expressing a preference for hospital services over community care.
Does poor access to other services contribute to frequent readmissions? Time and day of arrival had no significant impact on frequent readmissions. It might be expected that the more frequent emergency department users would opt for after hours or weekend visits when other community based services are less available. Our findings tend to negate any notion that access to after-hours and weekend services is an issue. However, the finding that ACS chronic conditions were associated with frequent readmissions suggests there are access issues at play. Although alternative general or specialist medical and chronic disease management services exists, there may be access difficulties other than the time of availability of services. Access factors such as, availability, accessibility, accommodation, affordability and acceptability, need to be further explored before we have a definitive answer on the impact on frequent readmissions. In particular, transport, location of community-based services and waiting times would act as barriers to access.
In our analysis, age and type of illness influenced readmissions. The impact of access issues on frequent readmissions is less clear. The other factors which could influence readmissions are related to patient preferences for the type of services, for example, general and specialist medical and chronic disease management services. If the uptake of these alternative services were to be increased, readmissions rates would be reduced. Further research to explore patient choice of services would be of benefit to the problem of frequent readmissions.
On the basis of the findings presented in this study, the question of whether readmissions are preventable was not directly answered, but the evidence from other studies shows that hospitalisation of chronic disease patients can be reduced by a range of targeted interventions to improve chronic disease management .
Logistic regression models were developed to identify the characteristics associated with frequent readmissions. The reliability of the predicting factors identified is determined by the robustness of the models. Although the overall fit of the model was significant, the Nagelkerk R2 values of less than 20% were relatively low. However, other studies of patient utilisation and clinical data have quoted similarly low Nagelkerk R2 values in logistic regression models [61, 62].
This study is limited by the fact that it involves data pertaining to one hospital only. Although the results may not be generalisable to all hospitals, they are relevant to similar sized hospitals in non-metropolitan urban areas. Comparison with other hospitals with a similar role would lend weight to these findings. Another limitation is the purpose of the data collection. The data forms part of the Emergency Department Information System collected by all NSW hospitals. The accuracy of the recording of primary diagnosis in the data base is complicated by the fact that many of the older patients have multiple comorbidities and the reason for their presentation may not be apparent until test results are available. It was not possible to make any estimation of socioeconomic status from the data available. However, the area which the hospital services, although it contains some affluent pockets, is generally a low socioeconomic area . As this study examines emergency department data only there is an inbuilt selection bias. We did not examine the use of other primary care services by people who did not access emergency department services. An expanded study to include the patterns of emergency department and community based primary care, particularly general practitioner services, is needed to develop population-based solutions to emergency department overcrowding. Another possible limitation is the failure of logistic regression analysis to take into account the intra-patient variability [51–54]. To address this issue we have compared the results of logistic and negative binomial regression models and found similar results. The relatively wide confidence intervals for some of the variables reduce the precision of the estimates. The study is also limited by the lack of a specific measurement of severity of illness.
This study of routinely collected hospital data identified the factors associated with frequent readmissions with the aim of exploring the reasons behind readmissions. Strategies to identify and improve access to alternative non-emergency department services for neuroses, COPD, dyspnoea and chronic heart failure patients, including chronic disease self management and case coordination services, would reduce readmissions. An early warning system for the unplanned return visit patients would allow for special strategies to be put in place to address the needs of these patients. Possible community-based services access barriers such as transport, location of community-based services and waiting times should be explored and reduced. This study has opened up the possibility that a patient's preference for hospital over non-hospital services might influence readmissions and warrants further investigation.
There are no acknowledgements.
- Australasian College of Emergency Medicine: Policy on Standard Terminology. 2009, [http://www.acem.org.au/media/policies_and_guidelines/P02_-_Standard_Terminology_16.04.09.pdf]Google Scholar
- Byrne M, et al: Frequent attenders to an emergency department: A study of primary health care use, medical profile, and psychosocial characteristics. Annals of Emergency Medicine. 2003, 41 (3): 309-318. 10.1067/mem.2003.68.View ArticlePubMedGoogle Scholar
- Fulde GWO, Duffy M: Emergency department frequent flyers: Unnecessary load or a lifeline?. Medical Journal of Australia. 2006, 184 (12): 595.PubMedGoogle Scholar
- Moore G, et al: Socio-demographic and clinical characteristics of re-presentation to an Australian inner-city emergency department: Implications for service delivery. BMC Public Health. 2007, 7.Google Scholar
- Sprivulis PC, et al: The association between hospital overcrowding and mortality among patients admitted via Western Australian emergency departments. Medical Journal of Australia. 2006, 184 (5): 208-212.PubMedGoogle Scholar
- Cameron PA: Hospital overcrowding: A threat to patient safety?. Medical Journal of Australia. 2006, 184 (5): 203-204.PubMedGoogle Scholar
- Richardson DB: Increase in patient mortality at 10 days associated with emergency department overcrowding.[see comment]. Medical Journal of Australia. 2006, 184 (5): 213-6.PubMedGoogle Scholar
- Coleman EA: How can we ground the "frequent fliers"?. Journal of the American Geriatrics Society. 2007, 55 (3): 467-8. 10.1111/j.1532-5415.2007.01094.x.View ArticlePubMedGoogle Scholar
- Locker TE, et al: Defining frequent use of an urban emergency department. Emergency Medicine Journal. 2007, 24 (6): 398-401. 10.1136/emj.2006.043844.View ArticlePubMedPubMed CentralGoogle Scholar
- Williams ERL, et al: Psychiatric status, somatisation, and health care utilization of frequent attenders at the emergency department A comparison with routine attenders. Journal of Psychosomatic Research. 2001, 50 (3): 161-167. 10.1016/S0022-3999(00)00228-2.View ArticlePubMedGoogle Scholar
- Lynch RM, Greaves I: Regular attenders to the accident and emergency department. Journal of Accident and Emergency Medicine. 2000, 17 (5): 351-354.View ArticlePubMedPubMed CentralGoogle Scholar
- Chan BTB, Ovens HJ: Frequent users of emergency departments. Do they also use family physicians' services?. Canadian Family Physician. 2002, 48: 1654-60.PubMedPubMed CentralGoogle Scholar
- Pope D, et al: Frequent users of the emergency department: a program to improve care and reduce visits. Canadian Medical Association Journal. 2000, 162 (7): 1017-20.PubMedPubMed CentralGoogle Scholar
- Olsson M, Hansagi H: Repeated use of the emergency department: Qualitative study of the patient's perspective. Emergency Medicine Journal. 2001, 18 (6): 430-434. 10.1136/emj.18.6.430.View ArticlePubMedPubMed CentralGoogle Scholar
- Genell Andrén K, Rosenqvist U: Heavy users of an emergency department--a two year follow-up study. Social Science and Medicine. 1987, 25 (7): 825-831. 10.1016/0277-9536(87)90040-2.View ArticlePubMedGoogle Scholar
- Hansagi H, et al: Frequent use of the hospital emergency department is indicative of high use of other health care services. Annals of Emergency Medicine. 2001, 37 (6): 561-567. 10.1067/mem.2001.111762.View ArticlePubMedGoogle Scholar
- Ansari Z, Laditka JN, Laditka SB: Access to health care and hospitalization for ambulatory care sensitive conditions. Medical Care Research and Review. 2006, 63 (6): 719-741. 10.1177/1077558706293637.View ArticlePubMedGoogle Scholar
- Kne T, Young R, Spillane L: Frequent ED users: Patterns of use over time. Am J Emerg Med. 1998, 16: 648-652. 10.1016/S0735-6757(98)90166-8.View ArticlePubMedGoogle Scholar
- Lucas RH, Sanford SM: An analysis of frequent users of emergency care at an urban university hospital. Annals of Emergency Medicine. 1998, 32 (5): 563-568. 10.1016/S0196-0644(98)70033-2.View ArticlePubMedGoogle Scholar
- Sun BC, et al: Characteristics and temporal trends of "left before being seen" visits in US emergency departments, 1995-2002. Journal of Emergency Medicine. 2007, 32 (2): 211-5. 10.1016/j.jemermed.2006.05.045.View ArticlePubMedGoogle Scholar
- Zuckerman S, Shen YC: Characteristics of occasional and frequent emergency department users do insurance coverage and access to care matter?. Medical Care. 2004, 42 (2): 176-182. 10.1097/01.mlr.0000108747.51198.41.View ArticlePubMedGoogle Scholar
- Mandelberg JH, Kuhn RE, Kohn MA: Epidemiologic analysis of an urban, public emergency department's frequent users. Academic Emergency Medicine. 2000, 7 (6): 637-646. 10.1111/j.1553-2712.2000.tb02037.x.View ArticlePubMedGoogle Scholar
- Blank FSJ, et al: A descriptive study of heavy emergency department users at an academic emergency department reveals heavy ED users have better access to care than average users. Journal of Emergency Nursing. 2005, 31 (2): 139-144. 10.1016/j.jen.2005.02.008.View ArticlePubMedGoogle Scholar
- Raymond H, Lucas MR, Sandra M, Sanford MSN: An Analysis of Frequent Users of Emergency Care at an Urban University Hospital. Ann Emerg Med. 1998, 32: 563-568. 10.1016/S0196-0644(98)70033-2.View ArticleGoogle Scholar
- Braitberg G: Emergency department overcrowding: dying to get in?. Medical Journal of Australia. 2007, 187 (11/12): 624-625.PubMedGoogle Scholar
- Bianco A, Pileggi C, Angelillo IF: Non-urgent visits to a hospital emergency department in Italy. Public Health. 2003, 117 (4): 250-255. 10.1016/S0033-3506(03)00069-6.View ArticlePubMedGoogle Scholar
- Huang CL, Choi WM: Characteristics of Emergency Services for the Elderly--A Regional Hospital Example. International Journal of Gerontology. 2009, 3 (4): 217-222. 10.1016/S1873-9598(10)70004-1.View ArticleGoogle Scholar
- Huang JA, et al: Analysis of Emergency Department Utilization by Elderly Patients Under National Health Insurance. The Kaohsiung Journal of Medical Sciences. 2003, 19 (3): 113-119. 10.1016/S1607-551X(09)70458-9.View ArticlePubMedGoogle Scholar
- Richardson DB: Elderly patients in the emergency department: a prospective study of characteristics and outcome.[see comment]. Medical Journal of Australia. 1992, 157 (4): 234-9.PubMedGoogle Scholar
- Dent AW, et al: The heaviest repeat users of an inner city emergency department are not general practice patients. Emergency Medicine. 2003, 15 (4): 322-329. 10.1046/j.1442-2026.2003.00470.x.View ArticlePubMedGoogle Scholar
- UK Department of Health: Patient at Risk of Readmission Tool. 2007, [http://webarchive.nationalarchives.gov.uk/+/www.dh.gov.uk/en/Healthcare/Longtermconditions/DH_4130655]Google Scholar
- Billings J, et al: Case finding for patients at risk of readmission to hospital: Development of algorithm to identify high risk patients. British Medical Journal. 2006, 333 (7563): 327-330. 10.1136/bmj.38870.657917.AE.View ArticlePubMedPubMed CentralGoogle Scholar
- Howell S, et al: Using routine inpatient data to identify patients at risk of hospital readmission. BMC Health Services Research. 2009, 9: 96-10.1186/1472-6963-9-96.View ArticlePubMedPubMed CentralGoogle Scholar
- Andersen RM: Revisiting the behavioral model and access to medical care: does it matter?. J Health & Soc Behav. 1995, 36 (1): 1-10.View ArticleGoogle Scholar
- Stein JA, Andersen R, Gelberg L: Applying the Gelberg-Andersen Behavioral Model for Vulnerable Populations to Health Services Utilization in Homeless Women. J Health Psychol. 2007, 12 (5): 791-804. 10.1177/1359105307080612.View ArticlePubMedGoogle Scholar
- Andersen R, Newman JF: Societal and individual determinants of medical care utilization in the United States. Milbank Memorial Foundation Quarterly. 1973, 51 (1): 95-124. 10.2307/3349613.View ArticleGoogle Scholar
- Padgett DK, Brodsky B: Psychosocial factors influencing non-urgent use of the emergency room: A review of the literature and recommendations for research and improved service delivery. Social Science and Medicine. 1992, 35 (9): 1189-1197. 10.1016/0277-9536(92)90231-E.View ArticlePubMedGoogle Scholar
- Padgett DK, et al: Predictors of emergency room use by homeless adults in New York City: The influence of predisposing, enabling and need factors. Social Science and Medicine. 1995, 41 (4): 547-556. 10.1016/0277-9536(94)00364-Y.View ArticlePubMedGoogle Scholar
- Billings J, Anderson GM, Newman LS: Recent Findings on Preventable Hospitalizations. Health Affairs. 1996, 15 (3): 239-249. 10.1377/hlthaff.15.3.239.View ArticlePubMedGoogle Scholar
- Laditka JN, Laditka SB, Mastanduno MP: Hospital utilization for ambulatory care sensitive conditions: Health outcome disparities associated with race and ethnicity. Social Science and Medicine. 2003, 57 (8): 1429-1441. 10.1016/S0277-9536(02)00539-7.View ArticlePubMedGoogle Scholar
- Zook CJ, Savickis SF, Moore FD: Repeated Hospitalization for the Same Disease: A Multiplier of National Health Costs. The Milbank Memorial Fund Quarterly. Health and Society. 1980, 58 (3): 454-471. 10.2307/3349734.View ArticlePubMedGoogle Scholar
- Calver J, et al: High-cost users of hospital beds in Western Australia: A population-based record linkage study. Medical Journal of Australia. 2006, 184 (8): 393-397.PubMedGoogle Scholar
- Malone RE: Heavy users of emergency services: Social construction of a policy problem. Social Science and Medicine. 1995, 40 (4): 469-477. 10.1016/0277-9536(94)E0116-A.View ArticlePubMedGoogle Scholar
- Richardson DB: 2009 Access Block Point Survey. 2009, The Road Trauma and Emergency Medicine Unit Australian National UniversityGoogle Scholar
- O'Connell T: Redesign for Hospital Avoidance, in Hospital Avoidance. 2008, [http://www.changechampions.com.au/resource/Tony_OConnell.pdf]Google Scholar
- Siminski P, et al: Primary care presentations at emergency departments: Rates and reasons by age and sex. Australian Health Review. 2008, 32 (4): 700-709. 10.1071/AH080700.View ArticlePubMedGoogle Scholar
- Masso M, et al: Why patients attend emergency departments for conditions potentially appropriate for primary care: Reasons given by patients and clinicians differ. Emergency Medicine Australasia. 2007, 19: 333-340. 10.1111/j.1742-6723.2007.00968.x.View ArticlePubMedGoogle Scholar
- Howard MS, et al: Patients' perspective on choosing the emergency department for nonurgent medical care: A qualitative study exploring one reason for overcrowding. Journal of Emergency Nursing. 2005, 31 (5): 429-435. 10.1016/j.jen.2005.06.023.View ArticlePubMedGoogle Scholar
- Hong R, Baumann BM, Boudreaux ED: The emergency department for routine healthcare: race/ethnicity, socioeconomic status, and perceptual factors. Journal of Emergency Medicine. 2007, 32 (2): 149-58. 10.1016/j.jemermed.2006.05.042.View ArticlePubMedGoogle Scholar
- Australasian College of Emergency Medicine: Australian Triage Scale. 2000, [http://www.acem.org.au/media/policies_and_guidelines/P06_Aust_Triage_Scale_-_Nov_2000.pdf]Google Scholar
- Coxe SS, West GL, Aiken S: The Analysis of Count Data: A Gentle Introduction to Poisson Regression and Its Alternatives. Journal of Personality Assessment. 2009, 91 (2): 121-136. 10.1080/00223890802634175.View ArticlePubMedGoogle Scholar
- Elhai JD, Calhoun PS, Ford JD: Statistical procedures for analyzing mental health services data. Psychiatry Research. 2008, 160 (2): 129-136. 10.1016/j.psychres.2007.07.003.View ArticlePubMedGoogle Scholar
- Hunt KA, et al: Characteristics of Frequent Users of Emergency Departments. Annals of Emergency Medicine. 2006, 48 (1): 1-8. 10.1016/j.annemergmed.2005.12.030.View ArticlePubMedGoogle Scholar
- Tsia : Appropriate Statistical Treatment of Frequent Emergency Department Visits in Health Services Research. Annals of Emergency Medicine. 2007, 49 (3): 385-10.1016/j.annemergmed.2006.08.044.View ArticleGoogle Scholar
- Pallant J: SPSS Survival Manual. 2007, Sydney: Allen & UnwinGoogle Scholar
- Tabachnick BG, Fidell LS: Using Multivariate Statistics. 2007, Boston: Allyn and Bacon, 5Google Scholar
- Nagelkerke NJD: A note on the general definition of the coefficient of determination. Biometrika. 1991, 78 (3): 691-692. 10.1093/biomet/78.3.691.View ArticleGoogle Scholar
- Norusis MJ: SPSS professional statistics 6.1. 1994, Chicago, Illinois: SPSS IncGoogle Scholar
- Government N: NSW State Plan. 2006, Premier's Department: SydneyGoogle Scholar
- Meldon SW, et al: A brief risk-stratification tool to predict repeat emergency department visits and hospitalizations in older patients discharged from the emergency department.[see comment]. Academic Emergency Medicine. 2003, 10 (3): 224-32. 10.1111/j.1553-2712.2003.tb01996.x.View ArticlePubMedGoogle Scholar
- Bernstein GA, et al: Somatic symptoms in anxious-depressed school refusers. Journal of the American Academy of Child and Adolescent Psychiatry. 1997, 36 (5): 661-668. 10.1097/00004583-199705000-00017.View ArticlePubMedGoogle Scholar
- Fleishman JA, et al: Using the SF-12 health status measure to improve predictions of medical expenditures. Medical Care. 2006, 44 (5 SUPPL).Google Scholar
- IRIS: Shellharbour. 2009, [http://www.iris.org.au/index.pl?page=222]Google Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1472-6963/10/216/prepub
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