title: What effect is really being measured? An alternative explanation of paradoxical phenomena in studies of osteoarthritis progression.
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Zhang
authors.forename: Tuhina
authors.initials: T
authors.lastname: Neogi
authors.forename: David
authors.initials: D
authors.lastname: Hunter
authors.forename: Frank
authors.initials: F
authors.lastname: Roemer
authors.forename: Jingbo
authors.initials: J
authors.lastname: Niu
mesh_terms: D018450:Disease Progression; D006801:Humans; D064887:Observational Studies as Topic / Q000379:methods; D010003:Osteoarthritis / Q000175:diagnosis* / Q000453:epidemiology* / Q000628:therapy; D016032:Randomized Controlled Trials as Topic / Q000379:methods; D015983:Selection Bias; D016896:Treatment Outcome