title: [Association or agreement between clinical measurement methods?].
abstract: Method comparison is often needed and unfortunately often analysed inappropriately. In particular, the use of correlation may be misleading with a high value of the correlation coefficient interpreted as an indication of good agreement. The difference between association and agreement are emphasized and the difference plot method is demonstrated using a worked example. Finally the interpretation of bias and limits of agreement are discussed.
authors.affiliation: Klinisk fysiologisk/nuklearmedicinsk afdeling, Amtssygehuset i Herlev.
authors.forename: M D
authors.initials: MD
authors.lastname: Engelmann
mesh_terms: D001774:Blood Chemical Analysis / Q000592:standards; D002624:Chemistry, Clinical / Q000592:standards; D003627:Data Interpretation, Statistical; D003718:Denmark; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007755:Laboratories, Hospital / Q000592:standards; D015588:Observer Variation; D019095:Point-of-Care Systems / Q000592:standards; D013223:Statistics as Topic
chemical_list: D006454:Hemoglobins