title: Letter to the editor: ordinal goal attainment scores are not suited to arithmetic operations or parametric statistics.
authors.forename: Eric
authors.initials: E
authors.lastname: Kerckhofs
mesh_terms: D003627:Data Interpretation, Statistical; D006233:Persons with Disabilities / Q000523:psychology / Q000534:rehabilitation; D006040:Goals; D006801:Humans; D009716:Numerical Analysis, Computer-Assisted; D020127:Recovery of Function; D012046:Rehabilitation / Q000706:statistics & numerical data*; D013223:Statistics as Topic