Association Between Frailty and Incident Urinary Incontinence in Older Adults: An Updated Systematic Review and Meta-Analysis
Abstract
Background
Frailty and urinary incontinence (UI) are common in older adults, contributing to functional decline, reduced quality of life, and increased healthcare use. The role of frailty in predicting new-onset UI remains unclear, as prior reviews focused on prevalence and cross-sectional data. We conducted an updated systematic review and meta-analysis of longitudinal studies to quantify the association between frailty and incident UI.
Methods
We searched MEDLINE, EMBASE, CINAHL, and Cochrane Library from January 2015 to December 2025 for studies examining frailty and incident UI in adults ≥60 years. Inclusion criteria were adults ≥60 years, living in nursing home settings, baseline frailty assessed with validated tools (Fried phenotype, Frailty Index), incident UI as a separate outcome, and follow-up ≥12 months. Exclusion criteria included cross-sectional studies, pre-existing UI, non-human studies, and abstracts without full text. Two reviewers screened 2,134 abstracts and 142 full texts. Data extracted included participant characteristics, frailty definition, UI type, follow-up, and effect estimates. Risk of bias was assessed using the Newcastle-Ottawa Scale (7/9). Pooled relative risks (RR) with 95% confidence intervals (CI) were calculated using random-effects models, with heterogeneity quantified by I²; subgroup analyses were performed by frailty phenotype and UI type.
Results
Twelve longitudinal studies (n=18,750 participants) met the inclusion criteria. Frailty at baseline was associated with a significantly increased risk of incident UI (pooled RR 1.65, 95% CI 1.35–2.01; I²=58%). Subgroup analyses revealed stronger associations for physical frailty phenotypes (RR 1.82, 95% CI 1.42–2.33) and for urge incontinence compared to stress or mixed UI. Sensitivity analyses confirmed robustness of results, and publication bias was low.
Conclusion
Frailty is a strong predictor of incident UI in older adults. These findings support integrating continence risk assessment into routine frailty evaluation within comprehensive geriatric assessment and highlight opportunities for early, preventive interventions targeting vulnerable older adults.