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Category Archives: Theory, concept and measure

Risk factors and symptoms in the definition of multimorbidity

By Tora Grauers Willadsen and Niels de Fine Olivarius
We want to share our new paper”The role of diseases, risk factors and symptoms in the definition of multimorbidity – a systematic review” (Scandinavian Journal of Primary Health Care 2016 March 8, : 1-10) here on the International Research Community on Multimorbidity’s (IRCMo) site.
Our objective was to explore how multimorbidity is defined in the scientific literature, with a focus on the role of diseases, risk factors, and symptoms in the definitions. We used systematic review as design. We searched MEDLINE (PubMed), Embase, and The Cochrane Library for relevant publications up until October 2013. One author extracted the information. Ambiguities were resolved, and consensus reached with one co-author. Our main outcome measures were: cut-off point for the number of conditions included in the definitions of multimorbidity; setting; data sources; number, kind, duration, and severity of diseases, risk factors, and symptoms.
We had the following results: In 61 (37 %) articles, out of the 163 articles we included, the cut-off point for multimorbidity was two or more conditions (diseases, risk factors, or symptoms). The most frequently used setting was the general population (68 articles, 42%), and primary care (41 articles, 25%). Sources of data were primarily self-reports (56 articles, 42%). Out of the 163 articles selected, 115 had individually constructed multimorbidity definitions, and in these articles diseases occurred in all definitions. As earlier found diabetes was the most frequent disease. Risk factors occurred in 98 (85%) and symptoms in 71 (62%) of the definitions. The severity of conditions was used in 26 (23%) of the definitions, but in different ways.
This review demonstrated, as shown previously, a heterogeneous definition of multimorbidity. Furthermore, it shows that risk factors are more often included than symptoms and that severity of conditions is seldom included in the definition. The fundamental role of risk factors in the definition of multimorbidity is one reason for the high prevalence of multimorbidity. Symptoms and severity are included less often and this contributes to making the existing definitions more usable for epidemiologists than for clinicians and patients. We believe this review adds to the discussion about more comprehensive and clinically relevant multimorbidity definitions.
To access the full manuscript, please click the following link:
At The research Unit for General Practice and Department of General Practice at The University of Copenhagen we are working on several projects about multimorbidity, both quantitative register-based studies including the whole Danish population, and qualitative studies. You are very welcome to contact us for more information. E-mail: olivarius@sund.ku.dk

Multimorbidity in two large Australian primary care practices

By Tom Brett

The Annals of Family Medicine recently published our research on multimorbidity among 7,247 patients attending two large Australian primary care practices (1). Our study set out to examine patterns and prevalence of multimorbidity and to estimate disease severity burden using the Cumulative Illness Rating Scale (CIRS).
We adhered strictly to Miller et al’s approach (2,3) in assessing number of body domains affected, the total score, the ratio of total score to number of domains (yielding a severity index), and importantly, the number of domains with maximum scores at levels 3 and 4. Highlighting the number of domains with severity scores of 3 and 4 is important as it helps guard against severity underestimation especially if there is a risk of severity index dilution with increased numbers of level 1 and 2 scores.
Our purposefully collected data, using combination of free-text electronic records, older hard copy files based on histories recorded by primary care physician, hospital discharge and outpatient letters and radiology and pathology reports, was extremely hard work and not for the fainted hearted! We feel our purposefully collected, multisource medical record data, based on 42 conditions across 14 domains and involving patients across the entire age spectrum provides further useful information for those interested in multimorbidity in primary care.
Our current research interest in the area involves patterns and prevalence of multimorbidity and disease severity burden involving disadvantaged and street-based populations.

1.    Brett T, Arnold-Reed DE, Popescu A, et al. Multimorbidity in patients attending 2 Australian primary care practices. Ann Fam Med 2013; 11(6): 535-542.
2.    Miller MD, Towers A. A manual of guidelines for scoring the Cumulative Illness Rating Scale for geriatrics (CIRS-G). Pittsburg, PA: University of Pittsburgh, 1991.
3.    Miller MD, Paradis CF, Houch PR, et al. Rating chronic illness burden in geropsychiatric practice and research: application of the Cumulative Illness Rating Scale. Psychiatry Res. 1992; 41 (3): 237-248.

The definition of multimorbidity: looking for a consensus

By Martin Fortin

We published recently a bibliometric study of English language publications indexed from 1970 to 2012 that showed a diversity of terms used to describe the presence of multiple concurrent diseases: comorbidity, multimorbidity, polymorbidity, polypathology, pluripathology, multipathology, multicondition [1]. Comorbidity was overwhelmingly used when one disease/condition was designated as index, as described by Feinstein [2]. Multimorbidity was the term most often used when no disease/condition was designated as index, but several different definitions exist.
We would like to invite you to have a look at the results of the bibliometric study and then to complete a two-question survey that should take you approximately one minute to complete. The questions are:
1-Which definition do you think should be used for multimorbidity?
a) Multiple co-occurring chronic or long-term diseases or conditions, none considered as index disease.
b) Multiple co-occurring diseases or conditions, none considered as index disease.
c) Any of the above definitions.
d) Another definition (please, provide a definition or a reference):


2-What is your country of origin? ____________________________

The deadline to participate in the survey is January 31, 2014. We would like to receive input from as many people as possible. Please consider completing the survey as your input is very important. Many thanks for your help.
Results of the survey will be posted in February 2014.

Click here to complete the survey

[1] Almirall J, Fortin M. The coexistence of terms to describe the presence of multiple concurrent diseases. Journal of Comorbidity. 2013;3(1):4-9.
[2] Feinstein AR. The pre-therapeutic classification of co-morbidity in chronic diseases. J Chronic Diseases. 1970;23:455-469.

Comparisons of multi-morbidity in family practice – issues and biases

By Moira Stewart, Martin Fortin, Helena Britt, Christopher Harrison, and Heather Maddocks

A recent study published in Family Practice “Comparisons of multi-morbidity in family practice – issues and biases” [1] compared the methods and results of three separate prevalence studies of multi-morbidity from; i) the Saguenay region of Quebec [2]; ii) a sub-study of the Bettering Evaluation and Care of Health (BEACH) program in Australia [3,4]; and iii) the Deliver Primary Health Care Information (DELPHI) project in South-western Ontario [5,6].

A re-estimate of the prevalence rates using identical age-sex groups found multi-morbidity prevalence to vary by as much as 61%, where reported prevalence was 95% among females aged 45–64 in the Saguenay study, 46% in the BEACH sub-study and 34% in the DELPHI study.

Several aspects of the methods and study designs were identified as differing among the studies, including the sampling of frequent attenders, sampling period, source of data, and both the definition and count of chronic conditions.

The paper offers a guide for authors reporting the methods used in multi-morbidity prevalence research, recommending detailed descriptions of the type of sampling, completeness and accuracy of the source of data, and the definition of chronic conditions.

Further comparisons among multi-morbidity data using agreed upon standards for the definition of chronic conditions and the way to count multi-morbidity are recommended to assess the impact of these methodological variations.


1 Stewart M, Fortin M, Britt H, Harrison C, Maddocks H.  Comparisons of multi-morbidity in family practice – issues and biases.  Family Practice. May 2013.  doi: 10.1093/fampra/cmt012.

2 Fortin M, Bravo G, Hudon C, Vanasse A, Lapointe L. Prevalence of multimorbidity among adults seen in family practice. Ann Fam Med 2005; 3: 223–8.

3 Britt HC, Harrison CM, Miller GC, Knox SA. Prevalence and patterns of multimorbidity in Australia. Med J Aust 2008; 189: 72–7.

4 Knox SA, Harrison CM, Britt HC, Henderson JV. Estimating prevalence of common chronic morbidities in Australia. Med J Aust 2008; 189: 66–70.

5 Stewart M, Thind A, Terry AL, et al. Multimorbidity in primary care: a study using electronic medical record (EMR) data. In: Thirty-Seventh Annual Meeting of North American Primary Care Research Group, Quebec, Canada, 14–18 November, 2009.

6 Stewart M, Thind A, Terry A, Chevendra V, Marshall JN. Implementing and maintaining a researchable database from electronic medical records—a perspective from an academic family medicine department. Healthc Policy 2009; 5: 26–39.

Multimorbidity measures

By Alyson Huntley

In the Academic Unit of Primary Health Care at the University of Bristol, one of our key research themes is organisation and delivery of care led by Professor Chris Salisbury.  This theme relates to providing evidence about the impact of changes in how primary health care is organised and delivered. Our research often combines quantitative, qualitative and economic methods. We have conducted a number of large scale multi-centre evaluations of important initiatives. We are particularly interested in the impact of these new models of care on core values of primary care such as access to care, generalism, co-ordination and continuity of care.

An important part of this research is the study of multimorbidity. We have several projects running in this area at the moment including:

  • The impact of multimorbidity on the use of resources in primary care
  • Complex consultations. The impact of multimorbidity on consultations.
  • A systematic review of measures of multimorbidity.

We have recently published the systematic review on multimorbidity measures in the Annals of Family Medicine (Huntley AL, Johnson R, Purdy S, Valderas JM, Salisbury C. Measures of multimorbidity and morbidity burden for use in primary care and community settings: a systematic review and guide. Ann Fam Med. 2012;10(2):134-41).

The aims of this review were to identify measures of multimorbidity and morbidity burden suitable for use in research in primary care and community populations, and to investigate their validity in relation to anticipated associations with patient characteristics, process measures, and health outcomes.

We found that the measures most commonly used in primary care and community settings are disease counts, Charlson index, ACG System, CIRS, CDS, and DUSOI. Different measures are most appropriate according to the outcome of interest. Choice of measure will also depend on the type of data available. More research is needed to directly compare performance of different measures.

The Disease Burden Morbidity Assessment (DBMA) by self-report

By Marie-Eve Poitras, RN. M.Sc.

Studies on multimorbidity should rely on valid and robust measurement to assess the disease burden experienced by patients with chronic diseases. There are many instruments designed to measure multimorbidity, however, most of them have to be administered by professionals because of the medical background required to complete them. This is a limitation to using these instruments in large samples of patients either in primary care settings or the general population.

Previous studies have shown that a measure that includes a weighting for severity is a better predictor of patient-related outcomes than a measure based on a simple disease count [1-2]. Severity can be judged on purely clinical grounds by health professionals or on the basis of the illness experienced by patients themselves. However, impact on daily living seems to be best evaluated by the patient because self-reported disease burden correlates with quality of life outcomes more strongly than measures of comorbidity based on other methods of data collection [3].

 The Disease Burden Morbidity Assessment (DBMA) is a self-report questionnaire that seems promising because: 1) it can be administered to large samples of patients and 2) it judges severity on the basis of the illness experienced by patients themselves [3].

 We conducted a study to test and to measure the properties of the French translation of the DBMA (DBMA-Fv). The DBMA-Fv’s properties were similar to its English counterpart as to its median sensitivity and specificity compared to chart reviews. It correlated moderately with an established index of multimorbidity, the Cumulative Illness Rating Scale (CIRS). A high percentage of patients were able to complete the test correctly as a mail questionnaire and it showed high test-retest reliability.

 The article describing the study can be accessed freely on line [4], where the readers can also find both the English and French versions of the DBMA questionnaire as appendices to the paper.

 1. Fortin, M., et al., Comparative assessment of three different indices of multimorbidity for studies on health-related quality of life. Health Qual Life Outcomes, 2005. 3:74.
2.Fortin, M., et al., Relationship between multimorbidity and health-related quality of life of patients in primary care. Qual Life Res, 2006. 15:83-91.
3. Bayliss, E.A., J.L. Ellis, and J.F. Steiner, Subjective assessments of comorbidity correlate with quality of life health outcomes: Initial validation of a comorbidity assessment instrument. Health and Quality of life Outcomes, 2005. 3:51.
4. Poitras, M.-E., et al., Validation of the disease burden morbidity assessment by self-report in a French-speaking population. BMC Health Service Research, 2012. 12:35.

Can we exclude exclusion criteria?

By Graham Watt
I keep a cartoon in which a patient tells a flummoxed psychiatrist,

” I have neither illusions nor delusions, Doc. My problem is that I exist day after day in grim reality”.

In seeking to pigeon-hole the patient as a case, the doctor ignores her reality.
Does the same thing happen in multiple morbidity?
Shakespeare first noted, “When troubles come, they come not single spies but in batallions”

That seems true of multiple morbidity in socio-economically deprived areas, defined as the “number, severity and complexity of health and social problems within families”.

Operational definitions of multiple morbidity in research studies, based on counts of conditions, get nowhere near this, largely missing out on social and family aspects.

The problem is heterogenity, something that research tries to eliminate.
How can multiple morbidity research put heterogenity centre stage, so that results inform the majority of patients’ circumstances and not only those meeting case definitions?

Of course, asking the question is the easy part.

Measuring Patients’ Perceptions of Patient-Centered Care

By Catherine Hudon

As many people affected by multimorbidity frequently interact with a family physician, [1-2] this professional is in a privileged position to play a significant role in their health. In patient-physician interactions, patient-centered care is widely acknowledged as a core value in family medicine [3-5] and has been associated with short term positive outcomes. [6-8] We decided to conduct a systematic review to identify and compare instruments, subscales or items assessing patient perception of patient-centered care in family medicine. We identified two instruments dedicated to measuring patient-centered care and eleven instruments that address some dimensions of this concept. The two instruments dedicated to patient-centered care measure key dimensions of this concept but are visit-based, limiting their applicability for long-term care processes such as chronic illness management. Relevant items from the eleven other instruments provide partial coverage of the concept but these instruments were not designed to provide a specific assessment of patient-centered care.
This article is published in the Mar/Apr 2011 issue of Annals of Family Medicine. To have free access to this article, click on this link:

1. Starfield B, Lemke K, Bernbardt T, Foldes S, Forrest C, Weiner J: Comorbidity: implications for the importance of primary care in case management. Annals of Family Medicine 2003, 1:8-14.
2. Broemeling A, Watson D, Prebtani F: Population patterns of chronic health conditions, co-morbidity and healthcare use in Canada: implication for policy and practices. Healthcare Quaterly 2008, 11:70-76.
3. World Health Organization. Former les personnels de santé du XXe siècle: le défi des maladies chroniques [http://www.who.int/chp/knowledge/publications/workforce_report_fre.pdf]
4. World Health Organization. The Innovative Care for Chronic Condition (ICCC). [http://www.who.int/diabetesactiononline/about/ICCC/en/index.html]
5. Wagner EH, Austin BT, Von Korff M: Organizing care for patients with chronic illness. Milbank Quarterly 1996, 74:511-544.
6. Stewart M, Brown JB, Donner A, McWhinney IR, Oates J, Jordan J: The impact of patient-centered care on outcomes. Journal of Family Practice 2000, 49:796-804.
7. Stewart M, Brown JB, Weston WW, Freeman TR: Patient-centred medicine: transforming the clinical method. 2nd edn. United Kingdom: Radcliffe Medical Press; 2003.
8. Little P, Everitt H, Williamson I, Warner G, Moore M, Gould C, Ferrier K, Payne S: Observational study of effect of patient centredness and positive approach on outcomes of general practice consultations. BMJ 2001, 323:908-911.

Coming soon: A new tool for multimorbidity

By Martin Fortin

Published data on chronic diseases and multimorbidity prevalence are mainly based on self-report, billing data and registries. Data, so far, show a large gap in their magnitude from one study to the other. Population-based data and primary care practice data show important discrepancies (1). Studies from several countries (2-4) used administrative data, but much variation in results is attributed to different conceptualizations of multimorbidity and various chronic disease definitions and classifications (5). The use of a validated measure or index appears promising but so far, no instrument has been formally identified for measuring multimorbidity and the resulting burden of disease either for the patient or at the practice level (6). Such an instrument would be a major contribution to the study of multimorbidity and for comparison purposes among practices, regions and countries. Resource allocation and policy making would also benefit from a robust measure that could be scored in various ways including the use of Electronic Medical Record (EMR) data.

We validated and used the Cumulative Illness Rating Scale (CIRS) in previous studies for the measure of multimorbidity using chart review (7-10).  Advantages were its exhaustive quality and the built-in assessment of severity. We have shown it to be a better predictor of health related quality of life (HRQoL) and psychological distress than the simple count of chronic diseases and it compared advantageously with other morbidity indexes when HRQoL was the outcome of interest (11-13). Others have used the count of CIRS domains as a measure of multimorbidity and have linked the domain to International Classification of Primary Care (ICPC) rubrics thus facilitating the link with EMR (14). We have shown that some domains of the CIRS did not correlate with outcomes for patients. Based on previous studies on multimorbidity (7-9, 12, 14-15) and our experience with the use of the CIRS, we developed the Multimorbidity Assessment Tool (MAT) aimed at measuring the burden of disease at patient level and to reflect on the burden for practices. The tool builds on the CIRS structure but redefines the domains to facilitate scoring. We removed the domains that were not associated with HRQoL (15). We also added other domains that were deemed more appropriate. For each domain, the score may vary from 0 to 3 depending on the number of conditions affecting the domain and their severity. The tool may generate various continuous scores depending on its use. The tool will be assessed for reliability and validity and is expected to be available in 2012..

1. Fortin M, Hudon C, Haggerty J, van den Akker M, Almirall J. Prevalence estimates of multimorbidity: a comparative study of two sources. BMC Health Services Research, 2010;10:111.
2. van den Akker, M., et al., Multimorbidity in general practice: prevalence, incidence, and determinants of co-occurring chronic and recurrent diseases. J Clin Epidemiol, 1998. 51: p. 367-375.
3. Macleod, U., et al., Comorbidity and socioeconomic deprivation: an observational study of the prevalence of comorbidity in general practice. European Journal of General Practice, 2004. 10(1): p. 24-6.
4. Uijen AA, van de Lisdonk EH. Multimorbidity in primary care: prevalence and trend over the last 20 years. Eur J Gen Pract. 2008;14 Suppl 1:28-32.
5. Valderas JM, Starfield B, Sibbald B, Salisbury C, Roland M. Defining comorbidity: implications for understanding health and health services. Ann Fam Med. 2009 Jul-Aug;7(4):357-63.
6. van den Akker, M., et al., Problems in determining occurrence rates of multimorbidity. J Clin Epidemiol, 2001. 54: p. 675-9.
7. Hudon C, Fortin M, Vanasse A. Cumulative Illness Rating Scale was a reliable and valid index in the family practice context. J Clin Epidemiol. 2005;58:603-8.
8. Hudon C, Fortin M, Soubhi H. Abbreviated guidelines for scoring the Cumulative Illness Rating Scale (CIRS) in family practice. Disponible à : www.elsevier.com/locate/clinepi J Clin Epidemiol. 2007; 60 :212.e1-e3.
9.  Fortin M, Bravo G, Hudon C, Vanasse A, Lapointe L. Prevalence of multimorbidity among adults seen in family practice. Ann Fam Med. 2005;3:223-28.
10. Fortin M, Steenbakkers K, Hudon C, Poitras ME, Almirall J, van den Akker M. The electronic Cumulative Illness Rating Scale: a reliable and valid tool to assess multimorbidity in primary care. Journal of Evaluation in Clinical Practice. Published online June 25th, 2010.
11. Fortin M, Bravo G, Hudon C, Lapointe L, Dubois MF, Almirall J. Psychological distress and multimorbidity in primary care. Ann Fam Med. 2006;4:417-22.
12. Fortin M, Bravo G, Hudon C, Lapointe L, Almirall J, Dubois M-F, Vanasse A. Relationship between multimorbidity and health-related quality of life of patients in primary care. Quality of Life Research. 2006;15:83-91.
13. Fortin M, Hudon C, Dubois MF, Almirall J, Lapointe L, Soubhi H. Comparative assessment of three different indices of multimorbidity for studies on health-related quality of life. Health and Quality of Life Outcomes. 2005;3:74. Disponible à: http://www.hqlo.com/content/3/1/74/abstract.
14. Britt HC, Harrison CM, Miller GC, Knox SA. Prevalence and patterns of multimorbidity in Australia. Med J Aust. 2008. 189(2):72-7.
15.Fortin M, Dubois MF, Hudon C, Soubhi H, Almirall J. Multimorbidity and quality of life: a closer look. HQLO 2007; 5 :52.