title: Confounding of subgroup analyses in randomized data.
authors.affiliation: University Medical Center Utrecht, Julius Center for Health Sciences and Primary Care, PO Box 85500, 3508 GA, Utrecht, The Netherlands. r.h.h.groenwold@umcutrecht.nl
authors.forename: Rolf H H
authors.initials: RH
authors.lastname: Groenwold
authors.forename: A Rogier T
authors.initials: AR
authors.lastname: Donders
authors.forename: Geert J M G
authors.initials: GJ
authors.lastname: van der Heijden
authors.forename: Arno W
authors.initials: AW
authors.lastname: Hoes
authors.forename: Maroeska M
authors.initials: MM
authors.lastname: Rovers
mesh_terms: D015986:Confounding Factors, Epidemiologic; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D013223:Statistics as Topic