title: How to report reliability in orthodontic research: Part 2.
abstract: Proper statistical analysis is an absolutely essential tool for both clinicians and researchers attempting to implement evidence-based decisions. When analyzing reliability, statistical graphic representation is the best method. Other previously published error studies of 2-dimensional measurements, such as cephalometric landmarks, have inappropriately applied 1-dimensional approaches, such as linear or angular measurements. The aim of this article is to illustrate a graphic presentation method that can be applied to 2-dimensional data sets. We propose that this technique can show errors in both the x-axis and the y-axis simultaneously and should be used when reporting the reliability of a 2-dimensional data set. Our prediction error analysis of soft-tissue changes after orthognathic surgery will be presented as an example. By using different colors in each ellipse, this method can also identify any between-group differences.
authors.affiliation: Department of Orthodontics, College of Dentistry, University of Florida, Gainesville, FL, USA.
authors.forename: Richard E
authors.initials: RE
authors.lastname: Donatelli
authors.forename: Shin-Jae
authors.initials: SJ
authors.lastname: Lee
mesh_terms: D002508:Cephalometry / Q000706:statistics & numerical data; D018865:Dental Research / Q000706:statistics & numerical data*; D055094:Evidence-Based Dentistry; D006801:Humans; D015588:Observer Variation; D009970:Orthodontics / Q000706:statistics & numerical data*; D015203:Reproducibility of Results