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. 2024 Aug 23;25:557. doi: 10.1186/s13063-024-08380-7

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — SPIRIT schedule of events. MSK-HQ, Musculoskeletal Health Questionnaire; SESMCD, Self-Efficacy Scale for Monitoring Chronic Disease; PFFS, Pictorial Fit-Frail Scale; FHQ, Falls History Questionnaire; CSRI, Client Service Receipt Inventory; HLQ, Health Literacy Questionnaire; SAIL, Secure Anonymised Information Linkage; SWAP, Study Within A Project; SAE, serious adverse event. ^ACompleted either online (with nominated support, if appropriate), or over the telephone with the central trial team. ^BAttached on site by trial staff and returned in post or in person, or sent in post with instructions on how to attach and returned in post