Application of accelerated time models to compare performance of two comorbidity-adjusting methods with APACHE II in predicting short-term mortality among the critically ill

George Mnatzaganian, Melanie Bish, Jason Fletcher, Cameron Knott, John Stephenson

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)


Objective: This study aimed to determine how the abilities of the Charlson Index and Elixhauser comorbidities compared with the chronic health components of the Acute Physiology and Chronic Health Evaluation (APACHE II) to predict in-hospital 30 day mortality among adult critically ill patients treated inside and outside of Intensive Care Unit (ICU). Methods: A total of 701 critically ill patients, identified in a prevalence study design on four randomly selected days in five acute care hospitals, were followed up from the date of becoming critically ill for 30 days or until death, whichever occurred first. Multiple data sources including administrative, clinical, pathology, microbiology and laboratory patient records captured the presence of acute and chronic illnesses. The exponential, Gompertz, Weibull, and log-logistic distributions were assessed as candidate parametric distributions available for the modelling of survival data. Of these, the log-logistic distribution provided the best fit and was used to construct a series of parametric survival models. Results: Of the 701 patients identified in the initial prevalence study, 637 (90.9%) had complete data for all fields used to calculate APACHE II score. Controlling for age, sex and Acute Physiology Score (APS), the chronic health components of the APACHE II score, as a group, were better predictors of survival than Elixhauser comorbidities and Charlson Index. Of the APACHE II chronic health components, only the relatively uncommon conditions of liver failure (3.4%) and immunodeficiency (9.6%) were statistically associated with inferior patient survival with acceleration factors of 0.35 (95% CI 0.17, 0.72) for liver failure, and 0.42 (95% CI 0.26, 0.72) for immunodeficiency. Sensitivity analyses on an imputed dataset that also included the 64 individuals with imputed APACHE II score showed identical results. Conclusion: Our study suggests that, in acute critical illness, most co-existing comorbidities are not major determinants of short-term survival, indicating that observed variations in ICU patient 30-day mortality may not be confounded by lack of adjustment to pre-existing comorbidities.

Original languageEnglish
Pages (from-to)81-88
Number of pages8
JournalMethods of Information in Medicine
Issue number1
Publication statusPublished - 1 Jan 2018


  • Accelerated time modelling
  • Charlson index
  • Critically ill
  • Elixhauser comorbidities
  • In-hospital mortality

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