Frailty independently predicts functional decline during hospital admission, meta-analysis finds

A systematic review and meta-analysis pooling 57 cohort studies of hospitalised adults aged 65 and over finds that frailty independently predicts worse outcomes across a hospital admission. Frail patients showed markedly worse functional status on discharge (activities-of-daily-living standardised mean difference −1.04), more than double the mortality risk of non-frail patients (risk ratio 2.26), a lower likelihood of being discharged home (risk ratio 0.79), and higher risk of readmission at 30 days (risk ratio 1.47) and 90 days (risk ratio 1.75). Pneumonia risk did not reach statistical significance. The review authors report substantial to considerable heterogeneity across the pooled outcomes and note that residual confounding across the 57 included cohorts warrants cautious interpretation of the pooled effect sizes.

Meta-analysis evidence of this strength and consistency across outcome domains supports frailty status as an independent marker of risk that hospital teams can act on from first contact, rather than treating age alone as the trigger for enhanced assessment. The authors’ own conclusion is that standardised frailty and functional-outcome assessment — consistent measurement across an admission, not frailty screening as a one-off gate — is what the evidence actually supports.