title: Patient classification.
authors.forename: M
authors.initials: M
authors.lastname: Willams
authors.forename: R A
authors.initials: RA
authors.lastname: McKenzie
mesh_terms: D000704:Analysis of Variance; D006801:Humans; D017116:Low Back Pain / Q000453:epidemiology / Q000628:therapy*; D010361:Patients / Q000145:classification*; D026741:Physical Therapy Modalities