The electronic Cumulative Illness Rating Scale: a reliable and valid tool to assess multi-morbidity in primary care

Authors

  • Martin Fortin MD MSc CMFC,

    Corresponding author
    1. Professor, Department of Family Medicine, Sherbrooke University, Sherbrooke, Québec, Canada and Family Doctor, Centre de Santé et de services sociaux de Chicoutimi, Chicoutimi, Québec, Canada
      Dr Martin Fortin, Unité de médecine de famille, 305 St-Vallier, Chicoutimi PQ G7H 5H6, Canada, E-mail: martin.fortin@usherbrooke.ca
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  • Karin Steenbakkers MD,

    1. Intern in Medicine
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  • Catherine Hudon MD MSc CMFC,

    1. Associate Professor, Department of Family Medicine, Sherbrooke University, Sherbrooke, Québec, Canada and Family Doctor, Centre de Santé et de services sociaux de Chicoutimi, Chicoutimi, Québec, Canada
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  • Marie-Eve Poitras RN MSc (c),

    1. Research Coordinator, Centre de Santé et de services sociaux de Chicoutimi, Chicoutimi, Québec, Canada
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  • José Almirall MD MSc PhD,

    1. Adjunct Professor, Department of Family Medicine, Sherbrooke University, Sherbrooke, Quebec, Canada and Research Assistant, Centre de Santé et de services sociaux de Chicoutimi, Chicoutimi, Québec, Canada
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  • Marjan van den Akker PhD

    1. Assistant Professor, Faculty of Health, Medicine and Life Sciences, School CAPHRI, Maastricht University, Maastricht, The Netherlands
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  • Conflict of interest: None reported.

Dr Martin Fortin, Unité de médecine de famille, 305 St-Vallier, Chicoutimi PQ G7H 5H6, Canada, E-mail: martin.fortin@usherbrooke.ca

Abstract

Rationale, aims and objectives  The presence of multiple concomitant diseases is an increasing health problem, and prompted by the limitations of the disease count, several indices measuring multi-morbidity or co-morbidity have been described to account for the overall burden of morbidity. The Cumulative Illness Rating Scale (CIRS) is one of those indices. We developed an electronic version of the CIRS (eCIRS) to take advantage of computerized data processing. The aim of this study was to evaluate the reliability and validity of the eCIRS scored in a primary care setting.

Methods  Two nurses interviewed 48 adult patients recruited during consecutive consultation periods in a primary care setting and scored the eCIRS in a random order during two sessions of data collection (T1 and T2) 1 month apart. We measured intra- and inter-rater reliability [intra-class correlation coefficient (ICC)]. We also assessed concomitant validity [(Pearson's correlation (r)] using standard CIRS scored by the attending family doctors.

Results  Intra-rater (ICC: 0.90 and 0.95) and inter-rater reliability (ICC: 0.86 and 0.91) were both excellent. No significant differences between the nurses' scores at T1 and T2 (P = 0.40 for nurse 1, = 0.73 for nurse 2) were found. The eCIRSs scored by the nurses were highly correlated with the CIRSs scored by the doctors (r = 0.80 and 0.88).

Conclusion  Reliable and valid, the eCIRS completed during patient interviews with trained nurses can be used to quantify multi-morbidity in primary care, either for research or clinical use.

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