Statistical methods for assessing agreement between double readings of clinical measurements

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dc.contributor.authorVieira, Sonia
dc.contributor.authorCorrente, José Eduardo [UNESP]
dc.contributor.institutionSao Leopoldo Mandic Dental Research Center
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-29T01:14:05Z
dc.date.available2022-04-29T01:14:05Z
dc.date.issued2011-01-01
dc.description.abstractStatistical analysis of data is crucial in cephalometric investigations. There are certainly excellent examples of good statistical practice in the field, but some articles published worldwide have carried out inappropriate analyses. Objective: The purpose of this study was to show that when the double records of each patient are traced on the same occasion, a control chart for differences between readings needs to be drawn, and limits of agreement and coefficients of repeatability must be calculated. Material and methods: Data from a well-known paper in Orthodontics were used for showing common statistical practices in cephalometric investigations and for proposing a new technique of analysis. Results: A scatter plot of the two radiograph readings and the two model readings with the respective regression lines are shown. Also, a control chart for the mean of the differences between radiograph readings was obtained and a coefficient of repeatability was calculated. Conclusions: A standard error assuming that mean differences are zero, which is referred to in Orthodontics and Facial Orthopedics as the Dahlberg error, can be calculated only for estimating precision if accuracy is already proven. When double readings are collected, limits of agreement and coefficients of repeatability must be calculated. A graph with differences of readings should be presented and outliers discussed.en
dc.description.affiliationSao Leopoldo Mandic Dental Research Center, Campinas, SP
dc.description.affiliationDepartment of Biostatistics Institute of Biosciences State University of Sao Paulo-UNESP, Botucatu-Distrito de Rubiao Jr, s/n-18618-900, Botucatu-Sao Paulo
dc.description.affiliationUnespDepartment of Biostatistics Institute of Biosciences State University of Sao Paulo-UNESP, Botucatu-Distrito de Rubiao Jr, s/n-18618-900, Botucatu-Sao Paulo
dc.format.extent488-492
dc.identifierhttp://dx.doi.org/10.1590/S1678-77572011000500009
dc.identifier.citationJournal of Applied Oral Science, v. 19, n. 5, p. 488-492, 2011.
dc.identifier.doi10.1590/S1678-77572011000500009
dc.identifier.issn1678-7765
dc.identifier.issn1678-7757
dc.identifier.scopus2-s2.0-80053929165
dc.identifier.urihttp://hdl.handle.net/11449/226560
dc.language.isoeng
dc.relation.ispartofJournal of Applied Oral Science
dc.sourceScopus
dc.subjectErrors
dc.subjectMeasurements
dc.subjectOrthodontics
dc.titleStatistical methods for assessing agreement between double readings of clinical measurementsen
dc.typeArtigo

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Artigos - Bioestatística - IBB