title: Many continuous variables such as the duration of the common cold should be analyzed using the relative scale.
authors.affiliation: Department of Public Health, University of Helsinki, POB 20, Tukholmankatu 8 B, FIN-00014, Helsinki, Finland. Electronic address: harri.hemila@helsinki.fi.
authors.forename: Harri
authors.initials: H
authors.lastname: Hemilä
mesh_terms: D003139:Common Cold; D006801:Humans