Abstract P388: Higher Social Vulnerability Was Associated With Less Community-Based Rehabilitation Utilization After Stroke

Background: Timely rehabilitation care significantly improves function and mobility after stroke, but barriers exist in access and utilization. The impact of neighborhood social determinants of health is not fully understood. Our study aims to estimate the association between Social Vulnerability Index (SVI), a measure of a community's need for support, and post-stroke rehabilitation utilization. Methods: This study is an observational, secondary analysis of the COMprehensive Post-Acute Stroke Services study, a pragmatic trial conducted in 41 North Carolina hospitals from 2016-2019. This analysis included 4765 individuals (51.2% female; 74.8% Whites; mean age 69.9) discharged directly home after stroke and linked to administrative claims. Utilization of physical or occupational therapy was obtained from outpatient, carrier file and home health claims. Geocoded participant addresses were linked to 2018 summary SVI percentile ranking and its four sub-domains at the Census tract level. Generalized estimation equations with cluster of Census tract and hospital were used to estimate the association between quintiles of SVIs and incidence proportion of rehabilitation use within 30 days. Covariates included patients’ socio-demographics, clinical characteristics, and comorbidities. Results: The overall proportion of rehabilitation use by 30 days was 38.6%, ranging from 34.6-46.5% across SVI quintiles. In multivariable analysis, quintiles of higher summary SVI were associated with lower rehabilitation use compared with the least vulnerable quintile (RD and 95% CI, Q5 vs Q1: -0.098 [-0.147 to -0.049]; Table). There was a significant decreasing trend across quintiles (P-trend < 0.001). Similar results were observed for SVI sub-domains except for minority status and language. Conclusion: Higher social vulnerability was associated with less post-stroke rehabilitation use. The finding is useful to identify communities for targeted interventions to improve access and utilization to rehabilitation.