title: Comments on number-needed-to-treat derived from ordinal scales.
authors.affiliation: idv-Data Analysis and Study Planning, 82152 Krailling/Munich, Konrad-Zuse-Bogen 17, Germany.
authors.forename: Helmuth
authors.initials: H
authors.lastname: Zimmermann
authors.forename: Volker W
authors.initials: VW
authors.lastname: Rahlfs
mesh_terms: D035843:Biomedical Research / Q000379:methods*; D003627:Data Interpretation, Statistical; D006801:Humans; D016017:Odds Ratio