title: Response to S.J. Day letter.
authors.affiliation: Statistics and Data Management, Pharmaceutical Division, Fisons plc, Leicestershire, UK.
authors.forename: M T
authors.initials: MT
authors.lastname: Stevens
authors.forename: T J
authors.initials: TJ
authors.lastname: Uryniak
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D005221:Fatigue; D012129:Respiratory Function Tests / Q000379:methods / Q000592:standards*