title: Number needed to treat: enigmatic results for exacerbations in COPD.
authors.affiliation: Dept of Statistics, GSK, Uxbridge, UK sally.x.lettis@gsk.com.
authors.forename: Sally
authors.initials: S
authors.lastname: Lettis
authors.affiliation: Dept of Statistics, GSK, Uxbridge, UK.
authors.forename: Oliver
authors.initials: O
authors.lastname: Keene
mesh_terms: D018450:Disease Progression; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive