title: [The interrater reliability of four common comorbidity indexes used in elderly patients].
abstract: OBJECTIVE
  To report on the interrater reliability of four common comorbidity indexes used in the hospitalised elderly: Charlson Index (CI), Geriatric Cumulative Illness Rating Scale (CIRS-G), Index of Co-existent Disease (CoD) and Kaplan-Feinstein Index (KFI).
  
  
  METHODS
  Four trained observers, independently reviewed the same 40 medical charts of hospitalised geriatric patients. Scores for the four indexes were calculated, along with the intraclass correlations coefficient (ICC) (quantitative index: CI and CIRS-G) and Kappa coefficient (qualitative index: CoD and KFI). The agreement <0.4 was considered deficient, 0-4-0.75 acceptable and >0.75 excellent.
  
  
  RESULTS
  A total of 40 patients (29 women) of 85.93 (±5.35) years were analysed. Intraclass correlations coefficient: CI: 0.78 (95% CI: 0.67-0.86); CIRS-G (score): 0.66 (95% CI: 0.53-0.78). Kappa coefficient: KFI: 0.51 to 0.76; CoD: 0.44-0.66. The application time was lower for the Charlson index (median of 39seconds [30-45]) and the KFI (42seconds [35-52]) and higher for CIRS-G (score) (128seconds [110-160]) and CoD (102seconds [80-124]).
  
  
  CONCLUSIONS
  Of the four comorbidity indexes used in a hospitalised elderly population, the CI, and CIRS-G (score), are those that have better interrater reliability. The Charlson index and KFI show a lower application time than the CIRS-G (score).
authors.affiliation: Servicio de Geriatría, Hospital de Sant Llàtzer, CST, Terrassa, Barcelona, Spain. MAZelada@cst.cat
authors.forename: Marco A
authors.initials: MA
authors.lastname: Zelada Rodríguez
authors.forename: Javier
authors.initials: J
authors.lastname: Gómez-Pavón
authors.forename: Pilar
authors.initials: P
authors.lastname: Sorando Fernández
authors.forename: Andrés
authors.initials: A
authors.lastname: Franco Salinas
authors.forename: Laurenny
authors.initials: L
authors.lastname: Mercedes Guzmán
authors.forename: Juan José
authors.initials: JJ
authors.lastname: Baztán
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015897:Comorbidity; D005260:Female; D015577:Geriatric Assessment / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D015588:Observer Variation; D015203:Reproducibility of Results