title: Effect modification.
authors.affiliation: State oral health director, Indiana State Department of Health, Indianapolis, Ind. Electronic address: JaMiller@isdh.in.gov.
authors.forename: James R
authors.initials: JR
authors.lastname: Miller
mesh_terms: D015986:Confounding Factors, Epidemiologic; D015987:Effect Modifier, Epidemiologic; D005146:Facial Asymmetry / Q000453:epidemiology; D006801:Humans; D008335:Mandibular Condyle / Q000293:injuries; D008337:Mandibular Fractures / Q000453:epidemiology; D012107:Research Design / Q000706:statistics & numerical data*; D012306:Risk; D012737:Sex Factors