title: The electronic Cumulative Illness Rating Scale: a reliable and valid tool to assess multi-morbidity in primary care.
abstract: OBJECTIVE
  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, P = 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).
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Family Medicine, Sherbrooke University, Sherbrooke, Québec, Canada. martin.fortin@usherbrooke.ca
authors.forename: Martin
authors.initials: M
authors.lastname: Fortin
authors.forename: Karin
authors.initials: K
authors.lastname: Steenbakkers
authors.forename: Catherine
authors.initials: C
authors.lastname: Hudon
authors.forename: Marie-Eve
authors.initials: ME
authors.lastname: Poitras
authors.forename: José
authors.initials: J
authors.lastname: Almirall
authors.forename: Marjan
authors.initials: M
authors.lastname: van den Akker
mesh_terms: D000328:Adult; D000368:Aged; D015897:Comorbidity; D003625:Data Collection / Q000379:methods*; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D009726:Nurses; D015588:Observer Variation; D010820:Physicians; D011320:Primary Health Care / Q000458:organization & administration*; D015203:Reproducibility of Results; D012959:Socioeconomic Factors