title: Reply.
authors.affiliation: Department of Medicine, County Durham and Darlington NHS Trust, Bishop Auckland, UK.
authors.forename: Chris
authors.initials: C
authors.lastname: Lawrence
authors.affiliation: Department of Medicine, County Durham and Darlington NHS Trust, Bishop Auckland, UK.
authors.forename: Isobel
authors.initials: I
authors.lastname: Chen
mesh_terms: D000402:Airway Obstruction / Q000503:physiopathology*; D001249:Asthma / Q000503:physiopathology*; D004242:Diving / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male
keywords: Lung function; letters (to the Editor); statistics