title: Data variability and validity: the elephant in the room.
authors.affiliation: Providence Health & Services Cardiovascular Disease Study Group, Portland, OR, USA. gary.grunkemeier@providence.org
authors.forename: Gary L
authors.initials: GL
authors.lastname: Grunkemeier
authors.forename: Anthony P
authors.initials: AP
authors.lastname: Furnary
mesh_terms: D000043:Abstracting and Indexing / Q000706:statistics & numerical data*; D000328:Adult; D001021:Aortic Valve / Q000601:surgery; D006348:Cardiac Surgical Procedures / Q000706:statistics & numerical data*; D002318:Cardiovascular Diseases / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*; D001026:Coronary Artery Bypass / Q000706:statistics & numerical data; D057225:Data Mining / Q000706:statistics & numerical data*; D019992:Databases as Topic; D006801:Humans; D008943:Mitral Valve / Q000601:surgery; D015588:Observer Variation; D010043:Outcome and Process Assessment, Health Care / Q000706:statistics & numerical data*; D011786:Quality Control; D012042:Registries; D015203:Reproducibility of Results; D012955:Societies, Medical / Q000706:statistics & numerical data; D016896:Treatment Outcome; D014481:United States