Statistical methods for assessing agreement between double readings of clinical measurements
Main Author: | |
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Publication Date: | 2011 |
Other Authors: | |
Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UNESP |
Download full: | http://dx.doi.org/10.1590/S1678-77572011000500009 http://hdl.handle.net/11449/17123 |
Summary: | 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 measurementsMeasurementsOrthodonticsErrorsStatistical 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.State Univ São Paulo UNESP, Inst Biosci, Dept Biostat, Botucatu, SP, BrazilSao Leopoldo Mandic Dent Res Ctr, Campinas, SP, BrazilState Univ São Paulo UNESP, Inst Biosci, Dept Biostat, Botucatu, SP, BrazilUniversidade de São Paulo (USP), Faculdade de Odontologia de BauruUniversidade Estadual Paulista (Unesp)Sao Leopoldo Mandic Dent Res CtrVieira, SoniaCorrente, Jose Eduardo [UNESP]2014-05-20T13:48:02Z2014-05-20T13:48:02Z2011-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article488-492application/pdfhttp://dx.doi.org/10.1590/S1678-77572011000500009Journal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 19, n. 5, p. 488-492, 2011.1678-7757http://hdl.handle.net/11449/17123S1678-77572011000500009WOS:000299004400009S1678-77572011000500009.pdf0000-0001-5478-4996Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Applied Oral Science1.7090,645info:eu-repo/semantics/openAccess2023-12-02T06:14:38Zoai:repositorio.unesp.br:11449/17123Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-12-02T06:14:38Repositório 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 Measurements Orthodontics Errors |
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, Jose Eduardo [UNESP] |
author_role |
author |
author2 |
Corrente, Jose Eduardo [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Sao Leopoldo Mandic Dent Res Ctr |
dc.contributor.author.fl_str_mv |
Vieira, Sonia Corrente, Jose Eduardo [UNESP] |
dc.subject.por.fl_str_mv |
Measurements Orthodontics Errors |
topic |
Measurements Orthodontics Errors |
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 |
2011-09-01 2014-05-20T13:48:02Z 2014-05-20T13:48:02Z |
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. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 19, n. 5, p. 488-492, 2011. 1678-7757 http://hdl.handle.net/11449/17123 S1678-77572011000500009 WOS:000299004400009 S1678-77572011000500009.pdf 0000-0001-5478-4996 |
url |
http://dx.doi.org/10.1590/S1678-77572011000500009 http://hdl.handle.net/11449/17123 |
identifier_str_mv |
Journal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 19, n. 5, p. 488-492, 2011. 1678-7757 S1678-77572011000500009 WOS:000299004400009 S1678-77572011000500009.pdf 0000-0001-5478-4996 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Applied Oral Science 1.709 0,645 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
488-492 application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo (USP), Faculdade de Odontologia de Bauru |
publisher.none.fl_str_mv |
Universidade de São Paulo (USP), Faculdade de Odontologia de Bauru |
dc.source.none.fl_str_mv |
Web of Science 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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1799965145726713856 |