title: Data dredging, bias, or confounding.
authors.forename: George Davey
authors.initials: GD
authors.lastname: Smith
authors.forename: Shah
authors.initials: S
authors.lastname: Ebrahim
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D003625:Data Collection / Q000379:methods; D003627:Data Interpretation, Statistical; D008019:Life Style; D010506:Periodicals as Topic; D016032:Randomized Controlled Trials as Topic