Perioperative medicine & outcomes

Impact of frailty on in-hospital outcomes in nonagenarian ICU patients: a binational multicenter analysis of 8,220 cases

Crit CarePublished Retrospective cohort study

Main finding · Hospital mortalityResult — go to the resultAdjusted hazard ratio 1.352 95% CI 1.192–1.534

Authors' conclusion

Frailty is a strong, independent predictor of hospital mortality and prolonged hospitalization in critically ill nonagenarians, even after adjusting for illness severity and comorbidities.

Study context

Population
Nonagenarians admitted to 211 intensive care units (ICUs) in Australia and New Zealand, 2017–2023, with documented Clinical Frailty Scale (CFS) scores (ANZICS Adult Patient Database)8,220 propensity matched
Participants
16,439 participants
Exposure
Frail vs non-frail
Outcome
In-hospital mortality and LOS (ICU and hospital mortality, ICU and hospital LOS)
Methodological detailspropensity-score matched (1:1), multicentre registry, binational
  • Propensity-score matched (1:1)
  • Multicentre registry
  • Binational

Main finding

Hospital mortality

Adjusted hazard ratio

1.352

95% CI 1.192–1.534

P < 0.001

Frail vs Non-frail
adjusted HR 1.352 (95% CI 1.192–1.534); P < 0.001

As reported in the abstract

Observational data: associations, not effects.

Further findings

OutcomeEstimateP value
ICU mortalityMatched cohortadjusted HR 1.242 (95% CI 1.044–1.440)P = 0.017
ICU mortality per one-point increase in CFSOR 1.09 (95% CI 1.01–1.18)P = 0.026
Hospital mortality per one-point increase in CFSOR 1.19 (95% CI 1.10–1.28)P < 0.001
OutcomeAdjusted β (95% CI)P value
Hospital LOSProlonged hospital LOS1.051 (1.033–1.070)P < 0.001

ICU lengths of stay (LOS)

Frailty not associated with ICU LOS after adjustment
P = 0.739

Original publication

Impact of frailty on in-hospital outcomes in nonagenarian ICU patients: a binational multicenter analysis of 8,220 cases. Crit Care. Published 27 August 2025. doi:10.1186/s13054-025-05612-3

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