Association of pre-stroke frailty and health-related factors with post-stroke functional independence among community-dwelling Chinese older adults

Frailty is associated with a range of poor post-stroke outcomes. There is still a lack of comprehensive understanding of the temporal relationship between pre-stroke frailty status and other related factors with functional recovery after stroke. This study aims to evaluate pre-stroke frailty status and health-related factors associated with functional independence among community-dwelling Chinese older adults.The dataset based on the China Health and Retirement Longitudinal Study (CHARLS) conducted in 28 provinces across China was used. The pre-stroke frailty status was assessed using the Physical Frailty Phenotype (PFP) scale with the 2015 wave data. The PFP scale consisted of five criteria with a total score of 5, and categorized into non-frail (0 point), prefrail (1 and 2 points), and frail (3 or more points). Covariates included demographic factors (age, sex, marital status, residence, and education level) and health-related variables (comorbidities, self-reported health status and cognition). Activities of daily living (ADL) and instrumental activities of daily living (IADL) were assessed as the functional outcomes, with difficulties in at least one of the 6 ADL items and 5 IADL items defined as ADL/IADL limitation respectively. A logistic regression model was used to estimate the associations.A total of 666 participants who were newly diagnosed with stroke during the 2018 wave were included. 234 (35.1%) participants were classified as non-frail, 380 (57.1%) participants were classified as prefrail, and 52 (7.8%) participants were classified as frail. Pre-stroke frailty was significantly associated with ADL and IADL limitations post stroke. Additional significant variables with ADL limitation were age, female and more comorbidities. Additional significant variables with IADL limitation were age, female, married or cohabitating, more comorbidities and pre-stroke lower global cognitive score.Frailty status was associated with ADL and IADL limitations after stroke. A more comprehensive assessment of frailty in older people may help to identify those with most significant risk for declining functional capacities after stroke and to develop appropriate intervention strategies.