The Frailty in Early Rehabilitation dataset is for the 2021 calendar year as described in the publication by Jones JRA, Berney S, Michael C, et al. Association between frailty and physical function recovery of people who received physiotherapy early rehabilitation during acute hospitalisation: An observational cohort study. The Journal of Frailty & Aging. 2025;14(3):100052. https://www.sciencedirect.com/science/article/pii/S226013412500043X. doi: 10.1016/j.tjfa.2025.100052..