Frailty and Hospitalization Risk in Older Adults Presenting to the Emergency Department
A Japanese study of 3,127 emergency department visits among adults aged 65 years or older found that frailty was associated with higher odds of hospitalization in patients assigned moderate- and lower-acuity triage categories. The overall interaction between frailty and triage urgency was not statistically significant, underscoring the need for further research into how frailty can support geriatric emergency assessment and disposition decisions.
KEY FINDINGS: This study suggests that frailty may provide clinically relevant information when assessing hospitalization needs in older adults presenting to the emergency department. The association was most apparent in patients assigned lower triage urgency categories, although the formal analysis did not confirm a statistically significant difference across categories.
Incorporating frailty assessment into geriatric emergency care may help clinicians consider functional vulnerability alongside acute illness severity. However, the findings are based on a single-center retrospective study and do not establish that frailty itself causes hospitalization. Further prospective, multicenter research is needed to clarify how frailty, social circumstances, clinical decision-making, and healthcare-system factors influence disposition.
BACKGROUND: Emergency department (ED) triage systems prioritize patients according to the urgency of their acute medical conditions. However, among older adults, frailty may also influence the need for hospitalization, even when patients have similar triage-assessed urgency. Understanding the relationship between frailty and hospital admission may help clinicians improve geriatric assessment and disposition decisions in emergency care.
DETAILS: This single-center retrospective cohort study was conducted at an urban tertiary hospital in Japan. Investigators analyzed emergency department visits by patients aged 65 years or older between November 2025 and March 2026. Frailty was defined as a score of 5 or higher on the Clinical Frailty Scale (CFS). Triage urgency was classified using the Japan Triage and Acuity Scale (JTAS). The primary outcome was hospitalization at the study hospital or transfer to another acute-care hospital. The investigators used mixed-effects logistic regression, adjusting for age, sex, mode of arrival, injury- or poisoning-related visits, living arrangements, and long-term care needs certification. The analysis also examined whether the association between frailty and hospitalization differed across triage categories.
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The study included 3,127 emergency department visits, of which 1,526 resulted in hospitalization. Among patients in JTAS category 2, frailty was not significantly associated with hospitalization (adjusted odds ratio [OR], 1.00; 95% CI, 0.65–1.55). In category 3, frailty was associated with higher odds of hospitalization (OR, 1.54; 95% CI, 1.19–1.99). In the combined JTAS categories 4 and 5, the adjusted odds of hospitalization were approximately twice as high among frail patients (OR, 2.01; 95% CI, 1.13–3.58). The association between frailty and hospitalization appeared stronger in the lower-acuity categories. However, the overall interaction between frailty and triage category was not statistically significant (P = 0.091), so the study did not establish that the association differed across triage levels.
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Source: Hata, N., Nagae, M., and Umegaki, H. Frailty and Hospitalization After Emergency Department Evaluation Within Triage Categories in Older Patients: A Retrospective Cohort Study. Academic Emergency Medicine. 2026; 33(10). Published: August 22, 2026. DOI: 10.1111/acem.70419.
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