title: [Number needed to treat: definition, interpretation and relevance].
authors.affiliation: Institut für Sozialmedizin, Epidemiologie und Gesundheitsökonomie Charité - Universitätsmedizin Berlin, 10098 Berlin. stephanie.roll@charite.de
authors.forename: S
authors.initials: S
authors.lastname: Roll
authors.forename: T
authors.initials: T
authors.lastname: Keil
authors.forename: S
authors.initials: S
authors.lastname: Rosenfeld
authors.forename: S N
authors.initials: SN
authors.lastname: Willich
mesh_terms: D003627:Data Interpretation, Statistical; D015991:Epidemiologic Measurements; D019317:Evidence-Based Medicine / Q000379:methods*; D017063:Outcome Assessment, Health Care / Q000379:methods*; D018401:Sample Size