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Dementia as a determinant of social and health service use in the last two years of life 1996-2003

BMC Geriatrics volume 11, Article number: 14 (2011) Cite this article

Abstract

Background

Dementia is one of the most common causes of death among old people in Finland and other countries with high life expectancies. Dementing illnesses are the most important disease group behind the need for long-term care and therefore place a considerable burden on the health and social care system. The aim of this study was to assess the effects of dementia and year of death (1998-2003) on health and social service use in the last two years of life among old people.

Methods

The data were derived from multiple national registers in Finland and comprise all those who died in 1998, 2002 or 2003 and 40% of those who died in 1999-2001 at the age of 70 or over (n = 145 944). We studied the use of hospitals, long-term care and home care in the last two years of life. Statistics were performed using binary logistic regression analyses and negative binomial regression analyses, adjusting for age, gender and comorbidity.

Results

The proportion of study participants with a dementia diagnosis was 23.5%. People with dementia diagnosis used long-term care more often (OR 9.30, 95% CI 8.60, 10.06) but hospital (OR 0.33, 95% CI 0.31, 0.35) and home care (OR 0.50, 95% CI 0.46, 0.54) less often than people without dementia. The likelihood of using university hospital and long-term care increased during the eight-year study period, while the number of days spent in university and general hospital among the users decreased. Differences in service use between people with and without dementia decreased during the study period.

Conclusions

Old people with dementia used long-term care to a much greater extent and hospital and home care to a lesser extent than those without dementia. This difference persisted even when controlling for age, gender and comorbidity. It is important that greater attention is paid to ensuring that old people with dementia have equitable access to care.

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Background

Dementia is one of the most common causes of death among old people. In 2007 it was the second most common cause of death among people aged 65 and over in Finland, and in 2009 it accounted for almost half of all deaths in the age group 80 or over [1, 2]. In the past two decades the number of deaths caused by dementia has doubled [2], and continues to account for a growing proportion of health and social service use [3].

There is evidence of marked differences in health and social service use between old people with and without dementia. Dementing illnesses are the most important predictor of long-term care among old people [4–8]. In a six-year follow up-study in Finland, 70% of women with dementia and 55% of men with dementia were institutionalized [9]. The research evidence on hospital use is contradictory: some studies indicate that people with dementia are more likely [10] and others that they are less likely [11, 12] to be hospitalized than those without the disease. Hospital stays tend to be longer for people with dementia [13, 14].

The differences in service use observed between old people with and without dementia are not necessarily due to dementia, but other factors may be at play. It seems that the effect of comorbid conditions varies between different service types. In one study, people with Alzheimer's disease or other dementia used more medical inpatient and outpatient services than those without these diseases because they were physically more ill [15]. Their increased risk of nursing home placement, on the other hand, was not explained by comorbid conditions [16]. However, it is difficult to assess the effect of comorbidity on service use because it is possible that other diseases of dementia sufferers' remain underdiagnosed [17] and thus undertreated.

Studies from different countries have shown that the proportion of old people treated in hospitals in their last year of life has increased over time, but there has been a trend towards shorter hospital stays, for instance in Australia in 1985-1994 [18], in the UK in 1976-1985 [19] and in the USA in 1985-1999 [20].

In Finland, the Ministry of Social Affairs and Health gives preference in its recommendations [21] to home care and sheltered housing over institutional care. The proportion of old people living in sheltered housing increased clearly from 1995 to 2005, while at the same time the proportion of old people in institutional care and home care decreased [3].

In this study, we compared the use of hospital care, long-term care and home care in the last two years of life among people with and without dementia diagnosis from 1996 to 2003. The main focus in earlier studies has been on either acute hospital or long-term care. Our study is population-based, including both people living in their own homes and in long-term care facilities. We hypothesized that old people with dementia use less hospital care and more long-term care in their last two years of life than people without dementia. We also hypothesized that service use among people with and without dementia has changed in line with Ministry of Social Affairs and Health recommendations [21]. The research was conducted as part of the project entitled "Costs of Care Towards the End of Life" (COCTEL). Our research questions were as follows:

  1. 1.

    How does health and social service use in the last two years of life differ between old people with and without dementia?

  2. 2.

    How did health and social service use in the last two years of life among old people with and without dementia change between the years from 1996 to 2003?

To answer these questions we analysed the proportion of service users and the number of days in care among those who used services.

Methods

Sample

The sample was drawn from the Causes of Death Register (Statistics Finland). All individuals in the study population were resident in Finland and had died at the age of 70 or over in 1998-2003. The sample consisted of:

  1. 1.

    all those who died at the age of 70 or over in 1998

  2. 2.

    those who belonged to a 40% random sample and died between 1999 and 2001 at the age of 70 or over and

  3. 3.

    all those who died at the age of 70 or over in 2002 or 2003.

For technical reasons it was not possible to include in the sample all deaths for the years 1999-2001. The random sample, representative of the underlying study population [22], was drawn from the Central Population Register of the total Finnish population aged 65 or over, alive on 31 December 1997.

Service use was examined for two years before death (i.e. 730 or 731 days before the day of death). Thus the data include decedents for six years and service use for eight years (since 1996).

Data sources

The data on health and social service use were derived from the following national registers: Care Register for Health Care, Care Register for Social Welfare and Home Care Census (National Institute for Health and Welfare, THL). The information from these registers was linked using unique personal identification number. A more detailed description of data collection has been given earlier [22]. Days in care were calculated for each individual on the basis of dates of admission to and discharge from care.

Permission to access the register data was obtained from each register controller. The data are not publicly available. The research plan was approved by the Pirkanmaa hospital district ethics committee.

Services

The services analysed were (1) hospital inpatient care (2) long-term care and (3) regular home care (at least once a week). Hospital use was analysed overall and separately for three types of hospitals representing different levels of care: university hospital, general hospital (central, district and private) and inpatient ward of health centre if the length of stay (LOS) was less than 90 days. Long-term care included residential home, sheltered housing with 24-hour assistance and inpatient ward of health centre (if LOS ≥90 days). Home care included both home nursing and home help. Two outcome measures were used, i.e. (1) any use of individual services during the follow-up, and (2) total number of days in care over potential multiple visits during the follow-up.

Dementia diagnosis

The dementia diagnoses were identified from the Causes of Death Register, Care Register for Health Care, Care Register for Social Welfare and Home Care Census. A person was categorized as suffering from dementia if in any of the registers they had an ICD-10 code for dementia (F00-F03) or Alzheimer's disease (G30). All aetiologies of dementia were thus included. In addition to the ICD-10 codes, dementia was identified on the basis of class 25 for dementia in a separate 54-grade cause of death classification [23]. We included contributing, immediate, intermediate, and underlying causes of death, and both main and secondary diagnoses in Care Registers.

Comorbidity

To take into account comorbidity, we identified ten major diagnoses or diagnostic groups from the Causes of Death Register and the Care Registers. These diagnoses were cancer (ICD10-codes C00-C97), diabetes (E10-E14), psychosis, depressive symptoms or other mental health disorders (F04-F99), Parkinson's disease or other neurological diseases (G00-G99 excluding G30, Alzheimer's disease, which is included in the dementia category), chronic asthma and COPD or other respiratory diseases (J00-J99), arthritis or osteoarthritis (M05-M06, M15-M19), hip fracture (S72), stroke (I60-I69), ischemic and other heart diseases excluding rheumatic and alcoholic heart diseases (I20-I25, I30-I425, I427-I52), and other diseases of the circulatory system (I00-I15, I26-I28, I70-I99). From these diagnostic groups we created (1) individual dummy variables for each of the 10 diagnostic categories and (2) a comorbidity variable, indicating the number of other diagnoses except for dementia.

Analyses

Comparisons of dichotomous variables were based on chi-square tests, for comparisons of continuous variables we used independent samples t-tests and one-way analysis of variance. The distribution of number of days in care was skewed, and therefore Mann-Whitney U-tests were used to analyse differences in them. Age and gender distributions were different in people with and without dementia. Therefore, for Figure 1, the proportion of services users and number of days in care were adjusted for the age and gender distribution of the whole sample separately for people with and without dementia and for different years of death.

Binary logistic regression models were used to study the likelihood of using different services. The number of days in care was studied for those who used the services at least once during the study period. Data were not available on the number of home care visits. Since days in care variables only yield positive integer values and therefore follow the count data distribution, negative binomial regression models were employed. The independent variables were age, gender, dementia, year of death, an interaction variable of dementia and year of death (dementia*year of death) and dummies for 10 diagnostic categories. If the coefficient of the interaction variable differed from zero (p < .05), additional analyses were performed separately for different years to examine how the effect of dementia differed between the years.

Descriptive analyses and binary logistic analyses were performed with SPSS (15.0) and negative binomial regression analyses were performed with Stata (8.2).

Results

Descriptives

The total number of decedents in 1998-2003 was 145,944, of whom 34,232 (23.5%) had a dementia diagnosis (Table 1). On average, people with dementia were 3.5 years older than people without dementia. The proportion of women was higher among dementia sufferers (69.6%) than among non-sufferers (56.2%).

Table 1 Descriptive characteristics of old people with (D+) and without (D-) dementia.
Full size table

Among dementia sufferers, 32.4% had Alzheimer's disease, 24.7% vascular dementia, 1.9% dementia related to some other disease and 66.0% unspecified dementia. The proportion with more than one dementia diagnosis was 21.6%. In the whole sample the proportion of people with a dementia diagnosis increased annually during the study period (p < .001). The average age at death of both people with and without dementia also increased (p < .001).

The number of other diagnoses was higher among individuals without dementia than among those with dementia (Table 1). Mental, neurological and respiratory diseases and hip fracture were more common among people with dementia, while other diseases were more common among people without dementia.

Use of different services

A higher proportion of people with dementia used long-term care during the last two years of life than people without dementia (Table 1). People without dementia used all types of hospitals and were clients of regular home care more often than people with dementia.

Among service users, people without dementia had more hospital days overall and in university hospital than those with dementia (Table 1). The number of days in general hospital, health centres and long-term care was higher among people with dementia than among those without it.

Annual differences over the study period

The proportion of hospital users increased during the follow-up among people with dementia and remained unchanged among people without dementia (Figure 1). The proportions of those who used university hospital or health centre increased, while the proportion of those who used general hospital decreased. These trends were seen both among people with and without dementia, although the changes were different in magnitude. The use of long-term care increased among people without dementia, but remained unchanged among people with dementia. The use of home care increased among people with dementia but no changes were seen among those without dementia.

Among service users, the mean number of days in hospital overall and in university hospital and general hospital decreased over time both among people with and without dementia (Figure 1), but more so among people with dementia. The mean number of days in health centres remained unchanged. Days in long-term care remained unchanged among people without dementia, but increased slightly among people with dementia.

Figure 1
figure 1

Proportions of service users and average number of days in care among those who used services in their last two years of life according to year of death. Adjusted for age and gender.

Full size image

Multivariate analyses

In models including all independent variables, people with dementia were clearly more likely (OR 9.30, 95%CI 8.60, 10.06) to use long-term care than those without dementia. On the other hand, their likelihood of using all types of hospitals or home care was lower (Table 2).

Table 2 Use of services (0 = no, 1 = yes) during last two years of life.
Full size table

Most diagnoses increased the likelihood of using different services (Table 2). Cancer and heart diseases increased the likelihood of hospital use, but decreased the likelihood of long-term care use. Diagnoses of mental disorders decreased the likelihood of university hospital use, but had no effect on the use of other hospitals (p > .05). Most diagnoses also increased the number of days in care (Table 3). We also ran the models using the number of other diagnoses instead of diagnosis-dummies, but the main results remained unchanged.

Table 3 Days in care during last two years of life among those who used services.
Full size table

The likelihood of hospital use, general hospital use and home care use decreased during our follow-up (Table 2). The likelihood of university hospital and long-term care use increased, while the use of health centres did not differ between the study years.

We calculated the interaction term (dementia*year of death) to assess whether the effect of dementia on service use changed by year of death. In all services the effect of this interaction was statistically significant, and we ran additional analyses (not shown) separately for those who died in different years. The differences between people with and without dementia in the likelihood of using each of the services diminished during the follow-up from 1998 to 2003.

Among service users, people with dementia had a higher number of days in care in all types of hospitals and in long-term care than people without dementia (Table 3).

The number of days in hospital overall and in general hospital among services users decreased during the follow-up (Table 3). The number of days in health centres and in long-term care increased over time. The number of days in university hospital remained unchanged (p > .05).

The interaction variable of dementia and year of death was not associated (p > 0.05) with number of days in general hospital and long-term care; a similar trend was seen in both people with and without dementia. Dementia increased the number of days in hospital overall and in health centre less among those who died towards the end of the follow-up (analyses not shown). The diagnosis of dementia increased the number of days in university hospital in the early part of the study period, but decreased that number towards the end of it.

People with dementia were less likely to use hospital care and home care than people without dementia. This is likely due, in part, to their more frequent use of long-term services. Therefore, we also analysed hospital and home care use separately among people with and without dementia who used no long-term care during their last two years of life (analyses not shown). In this sub-sample we found that the use of university and general hospital was less common among people with dementia than among those without dementia, but the use of health centre and home care was more common among those with dementia.

Discussion

Our aim was to compare the use of health and social services among people with and without a dementia diagnosis during their last two years of life in 1998-2003. We found that people with dementia were more likely to use long-term care but less likely to use hospital care and home care than people without dementia when age, gender, year of death and comorbidity were adjusted for. This was consistent with our hypothesis. Among service users, dementia sufferers spent more days in general hospital, health centre and long-term care than non-sufferers, but fewer days in university hospital.

Although the results describe the Finnish health and social care system and there may be differences between countries, they are broadly consistent with earlier findings from both Finland and elsewhere. It has been reported that dementia is a strong predictor of the use of long-term care e.g. [9, 24] but the evidence on the effect of dementia on the use of hospital care is inconclusive. Studies that do not take account of the proximity of death have reported that dementia increases the use of hospital care [10, 25, 26]. However studies focusing on service use among people in their last years of life have found that dementia decreases hospital use [11, 12]. This is supported by the results of the present study. Old people who are in long-term care are less likely to use hospital care, despite their comorbidity, especially those with dementia [27].

We started from the hypothesis that care practices and by the same token service use had changed during our study period from 1996 to 2003. In the case of hospital use the changes were dependent on the type of hospital: the probability of hospital use overall and general hospital use decreased, but the probability of university hospital use increased. In general there was a tendency towards shorter hospital stays, which has been a common trend in other countries over a longer time period [18–20]. Stays were shorter, particularly among people with dementia. Differences in service use between people with and without dementia decreased during the eight-year study period. The changes that were seen over time in service use among both groups may be due in part to organizational changes, or even to changes in the classification of hospitals. However, it is unlikely that such changes will have affected the differences between people with and without dementia.

The use of institutional long-term care increased during the study period. This is at sharp variance with current policy recommendations [21]. We analysed all types of long-term care together, including residential home, sheltered housing with 24-hour assistance and health centres (if length of stay ≥90 days). Therefore, the potential shift from residential care to sheltered housing, which has been reported previously [3] and which is in line with policy recommendations, does not show up in our results.

We found that people without a dementia diagnosis had more other diagnoses than people with dementia. The evidence is conflicting, however: it has been reported both that dementia sufferers have more diagnoses [16, 17, 28], and the same number of other diagnoses than non-sufferers [29, 30]. It has also been suggested that people with Alzheimer's disease are healthier than others [31]. Our data on comorbidity were derived from the Causes of Death Register and the Care Register for Health Care, which includes hospital diagnoses. Because hospital use was more common among people without dementia, their likelihood of having recorded diagnoses will obviously have been higher as well. It is also possible that the smaller number of other diagnoses among people with dementia is due to under-diagnosing [17]. Therefore, our comorbidity variables may underestimate the total level of comorbidity among people with dementia.

We did not have access to information on the time of diagnosis or the severity of dementia, which are important determinants of service use and thus health care costs [24, 32, 33], and important predictors of nursing home admission [34]. We also lumped Alzheimer's disease and other dementias together, even though there is some indication that service use may differ between them [35].

The proportion of people with a dementia diagnosis in the whole sample increased somewhat during our study period. We do not know whether this was due to improved diagnostic practices or more accurate registration of dementia diagnoses in hospital records, both of which are likely to have happened during our study period, or to decreased mortality among people with dementia. The diagnoses in the registers from which our data were drawn are closely in line with hospital records [36, 37]. Still, despite better diagnostics, it is likely that not all cases of dementia in our sample were recorded appropriately in the hospital records [38]. This may be the case especially in the early and mild phase of dementia, and may lead to selection bias towards the most advanced and severe cases. The prevalence of dementia in our sample is closely consistent with the figures for all old people in Finland [39]. However, no data are available on the prevalence of dementia among those living their last years of life.

Our multivariate analyses showed that during their last two years of life, younger old people and men were more likely to use hospital care than older and women, who in turn were more likely to use long-term care. These results confirm earlier findings e.g. [19, 40, 41]. However, it is not clear whether the effect of age and gender on the use of all services is similar among people with and without dementia. Age has been found to increase the risk for nursing home placement both among people with and without dementia [8], while age and dementia to increase this risk in both genders [42]. It is important that detailed attention is given to possible age and gender differences between old people with and without dementia in service use towards the end of life. Most urgently, however, further research should clarify whether the lower use of hospital care among people with dementia is due to their different needs, or whether it reflects their poorer access to specialized health care.

Conclusions

In this study we compared service use among old people with and without dementia in the last two years of life in an extensive population sample of people living either in their own homes or in care facilities. We found that people with dementia clearly used more long-term care and less hospital and home care than people without dementia, even though age, gender and comorbidity were controlled for. The results suggest that dementia sufferers' other diseases may remain underdiagnosed and undertreated. It is important to make sure that old people who suffer from dementia have equitable access to care.

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Acknowledgements

This project was supported by a grant to Professor Marja Jylhä from the Academy of Finland and a grant to Leena Forma MSc from the National Postgraduate School in Social and Health Policy, Management and Economics and the Doctoral Programs in Public Health.

We also thank the research group of Professor Pekka Martikainen (University of Helsinki) for kindly sharing their data (on those who died in 1998-2001) with us.

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Authors and Affiliations

  1. School of Health Sciences, FI-33014 University of Tampere, Finland

    Leena Forma, Pekka Rissanen, Mari Aaltonen, Jani Raitanen & Marja Jylhä

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  1. Leena Forma
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  2. Pekka Rissanen
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  3. Mari Aaltonen
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  4. Jani Raitanen
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Correspondence to Leena Forma.

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The authors declare that they have no competing interests.

Authors' contributions

LF: Conception and design of the study, acquisition of the data, analysis and interpretation of the data, drafting the manuscript, PR: Conception and design of the study, acquisition of the data, critical revision of manuscript, MA: Conception and design of the study, critical revision of manuscript, JR: acquisition of the data, analysis and interpretation of the data, critical revision of manuscript, MJ: Conception and design of the study, acquisition of the data, critical revision of manuscript. All authors read and approved the final manuscript.

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Forma, L., Rissanen, P., Aaltonen, M. et al. Dementia as a determinant of social and health service use in the last two years of life 1996-2003. BMC Geriatr 11, 14 (2011). https://0-doi-org.brum.beds.ac.uk/10.1186/1471-2318-11-14

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  • DOI: https://0-doi-org.brum.beds.ac.uk/10.1186/1471-2318-11-14

Keywords

BMC Geriatrics

ISSN: 1471-2318

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