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Dahlberg formula: a novel approach for its evaluation
Galvão, Maria Christina de Souza; Sato, João Ricardo; Coelho, Edvaldo Capobiango.
Affiliation
  • Galvão, Maria Christina de Souza; University of São Paulo.
  • Sato, João Ricardo; UMESP.
  • Coelho, Edvaldo Capobiango; University of São Paulo.
Dental press j. orthod. (Impr.) ; 17(1): 115-124, Jan.-Feb. 2012. ilus, tab
Article de En | LILACS | ID: lil-623179
Bibliothèque responsable: BR1.1
ABSTRACT

INTRODUCTION:

The accurate evaluation of error of measurement (EM) is extremely important as in growth studies as in clinical research, since there are usually quantitatively small changes. In any study it is important to evaluate the EM to validate the results and, consequently, the conclusions. Because of its extreme simplicity, the Dahlberg formula is largely used worldwide, mainly in cephalometric studies.

OBJECTIVES:

(I) To elucidate the formula proposed by Dahlberg in 1940, evaluating it by comparison with linear regression analysis; (II) To propose a simple methodology to analyze the results, which provides statistical elements to assist researchers in obtaining a consistent evaluation of the EM.

METHODS:

We applied linear regression analysis, hypothesis tests on its parameters and a formula involving the standard deviation of error of measurement and the measured values. RESULTS AND

CONCLUSION:

we introduced an error coefficient, which is a proportion related to the scale of observed values. This provides new parameters to facilitate the evaluation of the impact of random errors in the research final results.
Mots clés

Texte intégral: 1 Indice: LILACS langue: En Texte intégral: Dental press j. orthod. (Impr.) Thème du journal: ORTODONTIA Année: 2012 Type: Article

Texte intégral: 1 Indice: LILACS langue: En Texte intégral: Dental press j. orthod. (Impr.) Thème du journal: ORTODONTIA Année: 2012 Type: Article