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Chronic diseases in the geriatric population: morbidity and use of primary care services according to risk level

BMC Geriatrics volume 21, Article number: 278 (2021) Cite this article

Abstract

Background

Geriatric patients have significant morbidity and greater needs for care and assistance. The objective of this study was to describe the characteristics, morbidity, and use of services in primary care (PC) of patients with chronic diseases older than 65 years according to their risk level assigned by the adjusted morbidity groups (AMG) and to analyse the factors associated with the use of PC services.

Methods

This was a cross-sectional descriptive observational study. Patients older than 65 years from a healthcare service area, classified as chronically ill by the AMG classification system of the PC electronic medical record of the Community of Madrid, were included. Sociodemographic, clinical-care, and PC service utilization variables were collected. Univariate, bivariate and multivariate analyses were done.

Results

A total of 3292 chronic patients older than 65 years were identified, of whom 1628 (49.5%) were low risk, 1293 (39.3%) were medium risk and 371 (11.3%) were high risk. Their mean age was 78.1 (SD = 8.1) years and 2167 (65.8%) were women. Their mean number of chronic diseases was 3.8 (SD = 2), 89.4% had multimorbidity and 1550 (47.1%) were polymedicated. The mean number of contacts/year with PC was 19.5 (SD = 18.2) [men: 19.4 (SD = 19.8); women: 19.5 (SD = 17.4)]. The mean number of contacts/year in people over 85 years was 25.2 (SD = 19.6); in people 76–85 years old, it was 22.1 (SD = 20.3); and in people 66–75 years old, it was 14.5 (SD = 13.9). The factors associated with greater use of services were age (B coefficient [BC] = 0.3; 95%CI = 0.2–0.4), high risk level (BC = 1.9; 95%CI =0.4–3.2), weight of complexity (BC = 0.7; 95%CI = 0.5–0.8), and ≥ 4 chronic diseases (BC = 0.7; 95%CI = 0.3–1.1).

Conclusions

In the geriatric population, we found a high number of patients with chronic diseases and there were three levels of risk by AMG with differences in characteristics, morbidity, and use of PC services. The greatest use of services was by patients with older age, high risk level, greater weight of complexity and ≥ 4 chronic diseases. Further research is needed to develop an intervention model more adapted to the reality of the geriatric population based on risk levels by AMG.

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Background

The United Nations categorizes all those who are over 65 years old in developed countries as older adults [1]. In Spain, these people represent a significant percentage of the total population, amounting to almost 9.3 million people, over 1.5 million of whom are over 85 years of age [2].

There is no single and homogeneous definition of chronic disease, although many studies do seem to agree on a non-self-limiting nature, an association with persistent and recurrent health problems, anatomical and functional limitations or sequelae, and a long duration of the disease (months or years and not days or weeks) [3,4,5]. Approximately 42% of the Spanish population suffers from at least one chronic process, including 70% of those over 65, with a mean of four chronic diseases per person [6]. Multimorbidity also has different definitions, but all agree on the association of two or more concomitant chronic diseases in a patient [7,8,9]. The majority of the Spanish older adult population meets this criterion [10].

In recent decades, the global epidemiological pattern has progressively shifted to more chronic diseases instead of acute diseases, which has led to an increase in the use of social health services, both in primary care (PC) and in hospitals. This rise in health services utilization is attributed to follow-up and secondary prevention programs for chronic patients as well as emergency room visits, and hospitalizations for decompensation or acute worsening of chronic conditions [11]. Some studies estimate that patients with chronic diseases generate 80% of PC consultations, 60% of hospital admissions, 33% of emergency service visits, and up to 70% of healthcare spending [12].

A basic element of the strategies for treating chronic patients is the implementation of population morbidity classification systems based on predictive models from the PC electronic medical records. These tools stratify the population into different categories according to their morbidity and use of services, and their aim is to help plan the care model and identify, from the PC data, those individuals at higher risk so they can receive proactive and specific interventions. These interventions allow us to satisfy the social health needs of the most complex and older adults patients, improving the equity of health care and managing health resources more efficiently [13]. In Spain, morbidity classification systems such as the Clinical Risk Groups (CRG) [14] and the Adjusted Clinical Groups (ACG) have been used [15]. In recent years, the Adjusted Morbidity Groups (AMG) classification system [16] has been implemented in 13 autonomous communities as part of the strategies of care for patients with chronic diseases [17]. The AMG is an isocomplexity population classification case-mix tool that allows grouping of chronic patients according to their morbidity and complexity. In this way they are classified into mutually exclusive categories according to their level of risk following the Kaiser Permanente pyramid model (chronic patients with high risk, medium risk, low risk, and without relevant chronic pathology) [18]. According to these AMG risk level and with the knowledge of the patient and their context, the PC health professional responsible for the patient care determines the level of intervention to assign in the PC electronic clinical record and, therefore, the care plan to implement in order to offer a more personalized attention. Although there are studies on the usefulness of AMG and the stratification of chronic patients into different risk levels in the general population [16, 19, 20], there is little information on its specific use in the geriatric population [17, 21].

The main objective of this study was to describe the characteristics, morbidity, and use of services of chronic patients over 65 years of age in a healthcare service areaaccording to their risk level assigned by the AMG, as well as to analyse the factors associated with the use of PC services.

Methods

This was a cross-sectional descriptive observational study with an analytical approach. Patients older than 65 years identified as chronic by the AMG in the Ciudad Jardin health centre located in the Chamartín district of Madrid were included. This health centre treated a total population of 18,107, of whom 3863 were older than 65 years as of June 30, 2015. This district had a total population of 143,424 people, a mean age of 45 years (23% over 65), 55% women, 8.9% foreigners, and a MEDEA deprivation index located in quartile 1, which corresponds to the neighbourhoods with the lowest degree of deprivation in Madrid [22].

The AMG is a population classification system incorporated into the PC electronic medical record of the Community of Madrid (“AP-Madrid”). It considers as chronic all patients of any age who present at least one of the chronic diseases described in Additional file 1 [23]. The AMG assignment is based on the results on morbidity group and the level of complexity. The morbidity group classifies the population into mutually exclusive groups based on the diagnostic codes recorded in AP-Madrid for each patient by the health professionals responsible for their care. The complexity is calculated by the analysis of different variables, such as risk of mortality, admissions, visits to PC, and prescriptions, that are linked to the patient’s diagnoses and assigns the patient a numerical value of their complexity (complexity index). This index, allows the population to be stratified into three risk levels (high, medium, and low risk) as well as the subset without relevant chronic pathology (assigning four cut-off points obtained from the 40th, 70th, 85th, and 95th percentiles of the entire population) [16,17,18]. Besides, the AMG offers the PC doctor a summary label of the pathologies.

The variables studied were: a) sociodemographic variables (age, sex, region of origin), b) clinical care variables (immobilized at home, institutionalized in residence, need for a primary caregiver, home support, and palliative care [24], level of risk according to AMG, number and type of chronic diseases, multimorbidity, patient complexity index [numerical value of patient complexity assigned by AMG which is a index measured based on morbidity] [16], polymedication [patients with a medication regimen that implies having been prescribed five or more drugs for their chronic conditions as baseline treatment]), c) use of PC services (number of annual contacts, type of contact [administrative, laboratory or health], form of contact [face-to-face, telephone, home], and occupation of the contact professional [nurse, family doctor, dentist]). These variables were extracted from the information recorded in AP-Madrid database. Sociodemographic and clinical-care variables were recorded as of June 30, 2015, and the PC service use period was June 30, 2015 to June 30, 2016.

The prevalence of chronic patients in the basic health area was calculated, as well as their distribution into the high, medium, and low risk levels of AMG. A descriptive analysis of each variable was performed with frequencies and percentages for the qualitative data and with the mean (standard deviation), median (interquartile range), and test of normality for the quantitative data. For the bivariate analysis, the χ2 test was used for comparing qualitative variables (or Fisher’s exact test when appropriate), the Mann-Whitney U test was used for dichotomous and quantitative variables and the Kruskal-Wallis test was used for polytomous and quantitative variables. The statistical results of multiple testings were adjusted with the Bonferroni method. To analyse the factors associated with the use of PC services, a linear regression model was built, whose dependent variable was the number of total contacts with the health system and whose independent variables were those that were significantly associated in the univariate analysis or had clinical relevance. In order to simplify the analysis, regarding AMG risk levels, we made a dichotomous variable by combining low and medium risk compared with high risk. The results were considered statistically significant if p < 0.05. Data analysis was carried out with the statistical software IBM SPSS Statistics version 25.

The study has the approval of the Drug Research Ethics Committee of the La Princesa University Hospital and a favorable report from the Local Research Commission of the PC Management of the Community of Madrid.

Results

The prevalence of geriatric patients with at least one chronic disease in the basic health area was 3292 (85.2%), of whom 1628 (49.5%) were classified by the AMG as low risk, 1293 (39.3%) as medium risk, and 371 (11.2%) as high risk. Their mean age was 78.1 (SD = 8.1) years, and 2167 (65.8%) were women. With respect to nationality 2801 (85.1%) were Spanish, 96 (2.9%) European, and 395 (12%) from the rest of the world. Regarding the clinical-care variables, 286 (8.7%) were immobilized, and 154 (4.7%) were institutionalized in residence. A total of 218 patients (6.6%) had a primary caregiver at home, 77 (2.3%) needed home support, and 32 (1%) were receiving palliative care. The mean number of chronic diseases was 3.8 (SD = 2), 2493 (89.4%) had multimorbidity, and 1550 (47.1%) were polymedicated. These global characteristics are divided by sex and age group in Table 1 and by risk level in Table 2.

Table 1 Sociodemographic and clinical-care characteristics of chronic patients > 65 years, overall and by sex and age groups
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Table 2 Sociodemographic and clinical-care characteristics of chronic patients > 65 years, overall and according to risk level by adjusted morbidity groups (AMG)
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The most prevalent chronic pathologies within the study population were high blood pressure (67.6%), dyslipidaemia (58.8%), diabetes (21.5%), and osteoporosis (24.5%). These global characteristics are divided by sex and age group in Table 3 and by risk level in Table 4.

Table 3 Distribution of chronic comorbidities in chronic patients > 65 years of age during the year of study, overall and by sex and age groups
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Table 4 Distribution of chronic comorbidities in chronic patients > 65 years during the year of study overall and according to risk level by adjusted morbidity groups (AMG)
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As for the use of PC services, the mean number of annual contacts in patients older than 65 years was 19.5 (SD = 18.2), with a mean of 25.2 (SD = 19.6) in those over 85 years of age, of 22.1 (SD = 20.3) in the age group of 76–85 years, and of 14.5 (SD = 13.9) in the 66–75 group. Regarding to the type of contact, a mean of 16.8 (SD = 6.5) was medical and 1.5 (SD = 4.4) was administrative.

According to the contact form, a mean of 17 (SD = 14.6) was face-to-face contacts. The mean number of visits to the family doctor was 9.7 (SD = 8.1), 6.5 (SD = 9.9) to the nurse, and 0.2 (SD = 0.9) to the social worker. These data on the use of global PC services are divided by sex and age group in Table 5 and by risk level in Table 6.

Table 5 Use of annual services by chronic patients > 65 years by sex and age groups
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Table 6 Use of annual services by chronic patients > 65 years according to risk level by adjusted morbidity groups (AMG)
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In the multivariate analysis, factors associated with the use of PC services in geriatric patients in the model was age (B coefficient [BC] = 0.3; 95% CI = 0.2–0.4), high risk level (BC = 1.9; 95% CI = 0.5–3.4), ≥ 4 chronic diseases (BC = 0.7; 95% CI = 0.3–1.2) and complexity index (BC = 0.7; 95% CI = 0.6–0.8) (Table 7).

Table 7 Factors associated with the use of services by patients > 65 years
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Discussion

Some 85.2% of people over 65 years of age in the basic health area had chronic disease, figures similar to those of the National Health Survey of 2017 in Spain, which observed that 89.5% of people aged 65–74 years, 95.2% of those aged 75–84 years, and 96.5% of those aged over 85 years reported some disease or chronic health problem [25]. In other European countries, such as Italy, the figures also resemble those of our study, with 86% of those over 65 years of age having some chronic disorder [26]. These figures are higher than those reported by the National Center for Chronic Disease Prevention and Health Promotion of the United States, where 67.7% of those over 65 years belonging to the Medicare programme had at least one chronic disease [27]. The prevalence of chronic diseases was slightly higher than that observed in other studies that have used the AMG in Spain, such as that of the Chronicity Strategy Evaluation Report, where 77.6% of the population older than 65 years had at least one chronic health problem, a percentage that exceeded 80% in people older than 85 years [17].

This population of chronic patients older than 65 years had a high mean age; almost two-thirds (65.8%) were women; 89.4% had multimorbidity; and almost half (47.1%) were polymedicated. The predominance of women coincided with other series that showed a higher frequency of chronic diseases in women [28,29,30].

Women older than 65 years had greater immobility, more chronic diseases, and polypharmacy more often than men, as observed by other authors [31, 32]. Anxiety, depression, thyroid disorder, osteoporosis, obesity, high blood pressure, and dyslipidaemia predominated in women, while chronic obstructive pulmonary disease (COPD) and ischaemic heart disease predominated in men, in line with other studies [33, 34].

The mean age of our series was similar to that of other series of chronic patients older than 65 (74.9 years) [28, 35, 36]. Medium and high risk were more frequent in the age group older than 85 years (45 and 19.7%, respectively). High-risk patients presented a higher percentage of functional impairment and immobility than medium and low-risk patients, which has also been observed in complex chronic patients [31, 35, 37]. More high-risk chronic patients required primary caregivers than medium and low-risk chronic patients, but fewer than 40% of patients that had primary caregivers in other pluripathological series [31]. One series has reported a 0.4% rate of palliative care among chronically ill patients [38], lower to our data, and it was much more common in the high-risk stratum (6.5%). The mean number of chronic diseases was 2.6 in low-risk, 4.5 in middle-risk, and 7 in high-risk patients. The number of chronic diseases adjusted for age increased with age, as in other series [33, 39, 40]. The most frequent chronic diseases were similar to those in other series, with a cardiovascular, lung, neurological, kidney and osteoarticular disease predominance [34, 41, 42], and they were more severe in high and medium-risk chronic patients. Polypharmacy was high in high-risk patients (85.4% of patients), which is in line with the 50–94% of other studies [31, 41, 43] and is much higher than that observed in medium and low-risk patients (59.3 and 28.6%, respectively).

It’s remarkable that, while older adults from 65 to 75 years had only 9% of polymedication, older adults from 76 to 85 years experienced a high increase up to 75%. These can be explained because the potential negative health impacts of multimorbidity such as reduced quality of life and functional capacity, inadequate use of healthcare services and increased complications can be more pronounced in patients older than 75 years, needing a higher prescription of drugs in order to control their chronic diseases [44].

Thus, low-risk chronic geriatric patients have more often a single chronic disease, and medium-risk chronic patients normally are multipathological or multimorbid patients, terms that appear in the literature and that share frequencies and similar characteristics [31, 41]. High-risk chronic patients could be more specifically multipathological patients with functional and fragile deterioration or complex chronic patients, with a reported prevalence of these patients of 1.38–5% [45], similar to our finding.

The contact with PC of these chronic patients older than 65 years was high, similar to that observed in other studies with the same age [46] and higher than adults and children in other studies with AMG [11, 21]. The mean use of PC health services for these chronic patients was high at all risk levels and was much higher at high risk levels. The majority of contacts were health related and face-to-face, similar to the trend in other studies [11, 46,47,48]. The mean number of contacts with the family physician found in our study was lower than the mean number of medical consultations in other studies [49]. It was higher than the mean number of contacts with nursing, unlike other previous studies where the mean number of contacts with nursing was higher than the mean number of contacts with doctors [50]. This lower number of contacts with nursing by chronic patients should make us reflect on how care is being given to these patients, since the models of care that are proposed in the strategies for addressing chronicity prioritize care focussed on nursing and directing the intervention of the physician to processes that require medical care or situations of greater complexity [23]. In the same sense, visits to social workers were very rare, but it would be expected that the social care needs of some chronic patients would be higher, although the area covered by the centre overall is an area with good socioeconomic indicators. The availability of only one social worker for several centres can also influence the accessibility to the service. Also noteworthy is the low number of noncontact services and home visits, something that should be promoted in the framework of care for chronic geriatric patients as well as in the COVID-19 pandemic situation [51].

The two sexes had no significant differences in contact with PC despite other studies where was reported greater use of health-care services in women [32]. However, the different age groups did, annual contacts being higher in patients over 85 years of age than others, as is also observed in other studies [8, 11].

The increase in the use of PC services was significantly associated in the multivariate model with older age, high risk level, greater weight of complexity, and a number of chronic diseases ≥4, a profile similar to that of the complex chronic patient [31]. The variable which had a greatest impact on the PC services use was the high risk level. Thus, the AMG high risk level also help to identify patients with more need of care as happened in adult patients too and unlike pediatric patients where high risk level was not associated with more utilization of PC services [11, 20, 21].

As age influences in the PC services utilization, maybe older age could be taken more specifically in consideration by in the PC electronic clinical record when assigning the patient intervention level in the PC electronic clinical record along with the risk level by AMG.

Regarding the limitations, on the one hand, the basic health area was a neighbourhood with a medium–high socioeconomic level (MEDEA deprivation index in quartile 1) [22], which can make the population more likely to have double insurance that would reduce the use of health services of the public health system. However, more than 90% of people living in Madrid had access to public PC in 2015 [34]. The PC diagnostic information provides a good approximation of the morbidity of a population (especially chronic diseases), but it is not 100% complete, and some underreporting should be recognized since the coding of the diagnoses can vary according to the doctor who performs it. Despite all this, we have worked with real-world data, which provided a large volume of information from the population in real clinical practice conditions, overcoming the limitations of studies conducted with surveys or small samples. On the other hand, there are authors who have raised doubts about the transparency and complexity of AMG [52, 53], which has generated a debate on whether this situation is common to the rest of the commercial grouping tools [19, 54]. In addition, AMG has a clinical-healthcare management utility that considers the complexity and morbidity of the patient but does not take into account other factors, such as psychosocial problems. Even so, it has been a useful tool for measuring the burden of disease in PC, and the Ministry of Health aims to apply it to the entire National Health System for the management of chronic patients [16, 19].

In conclusion, almost 90% of the population older than 65 years from the health centre was classified by AMG as chronic. These chronic geriatric patients were stratified by AMG into three risk levels, which presented differences in sex, age, functional impairment, need for care, morbidity, complexity, polypharmacy, and use of PC services. The greatest use of services was by patients with older age, high risk level, greater weight of complexity, and ≥ 4 chronic diseases. Further research is needed to be able to develop an intervention model more adapted to the reality of the geriatric population based on risk levels by AMG.

Availability of data and materials

The datasets generated and analysed during the current study are not publicly available due the belong to the Madrid Primary Care Electronic Clinical Record (AP Madrid) but are available from the corresponding author on reasonable request.

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Acknowledgements

To the professionals of the Healthcare Centre Ciudad Jardín and the Research Unit of the Primary Care Management of Madrid for their methodological support.

Funding

This project received a grant for the translation and publication of this paper from the Foundation for Biosanitary Research and Innovation in Primary Care (FIIBAP).

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Authors and Affiliations

  1. Research Unit, Primary Health Care Management of Madrid, Madrid, Spain

    Jaime Barrio-Cortes

  2. Foundation for Biosanitary Research and Innovation in Primary Care, Madrid, Spain

    Jaime Barrio-Cortes

  3. Faculty of Health, Camilo José Cela University, Madrid, Spain

    Jaime Barrio-Cortes

  4. Healthcare Centre Ciudad Jardín, Primary Health Care Management of Madrid, Madrid, Spain

    Almudena Castaño-Reguillo, Mariana Bandeira-de Oliveira, Carmen López-Rodríguez & María Ángeles Jaime-Sisó

  5. Preventive Medicine Department, Virgen de la Salud Hospital, Toledo Hospital Complex, Toledo, Spain

    María Teresa Beca-Martínez

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  1. Jaime Barrio-Cortes
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Contributions

JBC: Conceptualization; Data curation; Formal analysis; Funding acquisition; Investigation; Methodology; Project administration; Resources; Software; Supervision; Validation; Visualization; Roles/Writing - original draft; Writing - review & editing. ACR: Conceptualization; Data curation; Formal analysis; Investigation; Methodology; Validation; Visualization; Roles/Writing - original draft; Writing - review & editing. MTBM: Conceptualization; Data curation; Formal analysis; Investigation; Methodology; Validation; Visualization; Roles/Writing - original draft; Writing - review & editing. MBDO: Conceptualization; Data curation; Formal analysis; Investigation; Methodology; Validation; Visualization; Roles/Writing - original draft; Writing - review & editing. MCLR: Conceptualization; Methodology; Validation; Visualization; Roles/Writing - original draft; Writing - review & editing. MAJS: Conceptualization; Methodology; Validation; Visualization; Roles/Writing - original draft; Writing - review & editing. The authors read and approved the final manuscript.

Corresponding author

Correspondence to Jaime Barrio-Cortes.

Ethics declarations

Ethics approval and consent to participate

The study has the approval of the Drug Research Ethics Committee of the La Princesa University Hospital and a favorable report from the Local Research Commission of the Primary Care Management of the Community of Madrid. All methods were performed in accordance with the relevant guidelines and regulations. No informed consent was obtained because the manuscript does not contain any individual personal data since the data were obtained from a secondary database with anonymized and dissociated information as stipulated by current legislation at the time of the study.

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Not applicable.

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The authors declare that they have no competing interests.

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Supplementary Information

Additional file 1.

Types of chronic diseases considered by the Adjusted Morbidity Group (AMG) in the Community of Madrid at the time of data extraction.

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Barrio-Cortes, J., Castaño-Reguillo, A., Beca-Martínez, M.T. et al. Chronic diseases in the geriatric population: morbidity and use of primary care services according to risk level. BMC Geriatr 21, 278 (2021). https://doi.org/10.1186/s12877-021-02217-7

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Keywords

BMC Geriatrics

ISSN: 1471-2318

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