Physical and occupational therapy utilization and associated factors among adults with cerebral palsy: Longitudinal modelling to capture distinct utilization groups

Adults with cerebral palsy (CP) experience functional declines. Clinical rehabilitation may preserve function for this population. To identify longitudinal physical/occupational therapy use and associated factors among adults with CP, to inform health promotion strategies. A retrospective cohort study including adults ≥ 18 years of age with CP was performed using a random 20% Medicare fee-for-service dataset. Participants with continuous medicare enrolment from 01/01/2016-12/31/2018 were included: 2016 was the one-year baseline period; 2017–2018 was the two-year follow-up. Therapy included an indication of physical, occupational, or other forms of therapy. Two-year therapy use patterns were identified using group-based trajectory modeling. Multivariable multinomial logistic regression models identified associations between baseline characteristics with trajectory groups. Of 17,441, 7231 (41.5%) adults with CP had therapy use across the three-year period, and six longitudinal therapy trajectories were identified: the majority (42.5%) were low-consistent users, 13.4% moderate-consistent users, 4.4% high-consistent users, and the remaining variable users. Associations between baseline characteristics (e.g., age, sex, comorbidities) with trajectory groups varied. For example, using the low-consistent users as the reference, Black versus White were 49% less likely, Northeast versus South residency were 7.52-fold more likely, and co-occurring neurologic conditions versus CP only were up to 118% more likely to be high-consistent users (all, P