Statistical methods for assessing agreement between double readings of clinical measurements
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Data de Publicação: | 2011 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S1678-77572011000500009 http://hdl.handle.net/11449/226560 |
Resumo: | Statistical 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. |
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Statistical methods for assessing agreement between double readings of clinical measurementsErrorsMeasurementsOrthodonticsStatistical 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.Sao Leopoldo Mandic Dental Research Center, Campinas, SPDepartment of Biostatistics Institute of Biosciences State University of Sao Paulo-UNESP, Botucatu-Distrito de Rubiao Jr, s/n-18618-900, Botucatu-Sao PauloDepartment of Biostatistics Institute of Biosciences State University of Sao Paulo-UNESP, Botucatu-Distrito de Rubiao Jr, s/n-18618-900, Botucatu-Sao PauloSao Leopoldo Mandic Dental Research CenterUniversidade Estadual Paulista (UNESP)Vieira, SoniaCorrente, José Eduardo [UNESP]2022-04-29T01:14:05Z2022-04-29T01:14:05Z2011-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article488-492http://dx.doi.org/10.1590/S1678-77572011000500009Journal of Applied Oral Science, v. 19, n. 5, p. 488-492, 2011.1678-77651678-7757http://hdl.handle.net/11449/22656010.1590/S1678-775720110005000092-s2.0-80053929165Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Applied Oral Scienceinfo:eu-repo/semantics/openAccess2022-04-29T01:14:05Zoai:repositorio.unesp.br:11449/226560Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-29T01:14:05Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Statistical methods for assessing agreement between double readings of clinical measurements |
title |
Statistical methods for assessing agreement between double readings of clinical measurements |
spellingShingle |
Statistical methods for assessing agreement between double readings of clinical measurements Vieira, Sonia Errors Measurements Orthodontics |
title_short |
Statistical methods for assessing agreement between double readings of clinical measurements |
title_full |
Statistical methods for assessing agreement between double readings of clinical measurements |
title_fullStr |
Statistical methods for assessing agreement between double readings of clinical measurements |
title_full_unstemmed |
Statistical methods for assessing agreement between double readings of clinical measurements |
title_sort |
Statistical methods for assessing agreement between double readings of clinical measurements |
author |
Vieira, Sonia |
author_facet |
Vieira, Sonia Corrente, José Eduardo [UNESP] |
author_role |
author |
author2 |
Corrente, José Eduardo [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Sao Leopoldo Mandic Dental Research Center Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Vieira, Sonia Corrente, José Eduardo [UNESP] |
dc.subject.por.fl_str_mv |
Errors Measurements Orthodontics |
topic |
Errors Measurements Orthodontics |
description |
Statistical 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. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-01-01 2022-04-29T01:14:05Z 2022-04-29T01:14:05Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S1678-77572011000500009 Journal of Applied Oral Science, v. 19, n. 5, p. 488-492, 2011. 1678-7765 1678-7757 http://hdl.handle.net/11449/226560 10.1590/S1678-77572011000500009 2-s2.0-80053929165 |
url |
http://dx.doi.org/10.1590/S1678-77572011000500009 http://hdl.handle.net/11449/226560 |
identifier_str_mv |
Journal of Applied Oral Science, v. 19, n. 5, p. 488-492, 2011. 1678-7765 1678-7757 10.1590/S1678-77572011000500009 2-s2.0-80053929165 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Applied Oral Science |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
488-492 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1799964719442821120 |