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. 2020 Aug 27;10(8):e033646. doi: 10.1136/bmjopen-2019-033646

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Estimates and 95% CIs of single-level approaches to the analysis of change in Oxford Hip Score pre- post-surgery and its association with body mass index (BMI) adjusted for confounding. ANCOVA, analysis of covariance; OLS, ordinarily least squares; SACS, Simple Analysis of Change Scores.