title: Linear, nonlinear or categorical: how to treat complex associations in regression analyses? Polynomial transformations and fractional polynomials.
authors.affiliation: Institute for Community Medicine, SHIP-KEF, University Medicine of Greifswald, Walther-Rathenau Str 48, 17475 Greifswald, Germany. carsten.schmidt@uni-greifswald.de
authors.forename: Carsten Oliver
authors.initials: CO
authors.lastname: Schmidt
authors.forename: Till
authors.initials: T
authors.lastname: Ittermann
authors.forename: Andrea
authors.initials: A
authors.lastname: Schulz
authors.forename: Hans J
authors.initials: HJ
authors.lastname: Grabe
authors.forename: Sebastian E
authors.initials: SE
authors.lastname: Baumeister
mesh_terms: D006801:Humans; D016014:Linear Models; D015233:Models, Statistical; D017711:Nonlinear Dynamics; D012044:Regression Analysis