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- Analysis of change in patient-reported outcome measures with floor and ceiling effects using the multilevel Tobit model: a simulation study and an example from a National Joint Register using body mass index and the Oxford Hip ScoreAdrian Sayers, Michael R Whitehouse, Andrew Judge, Alex J MacGregor, Ashley W Blom, Yoav Ben-ShlomoBMJ Open Aug 2020, 10 (8) e033646; DOI: 10.1136/bmjopen-2019-033646
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