title: Measuring small changes versus measurement error.
authors.forename: Harri
authors.initials: H
authors.lastname: Sievänen
mesh_terms: D015502:Absorptiometry, Photon; D015982:Bias; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008875:Middle Aged; D010024:Osteoporosis / Q000000981:diagnostic imaging / Q000473:pathology*