title: Dental caries and quality of life of preschool children: discriminant validity of the ECOHIS
abstract: The aim of the present study was to confirm the discriminant validity (obtained using traditional statistical methods) of the Early Childhood Oral Health Impact Scale (ECOHIS) between preschool children with and without caries (mean score) through an evaluation of the effect size. A systematic search of electronic databases and a manual search were performed for studies published up to December 2015 involving the use of the ECOHIS for the evaluation of the impact of dental caries on oral health-related quality of life (OHRQoL) among preschool children. Two independent raters performed the selection of the studies and data extraction. Only papers published in English and Spanish were selected. No restrictions were imposed regarding the year of publication. Twelve studies were included, and the magnitude of standardized differences between the means of the "without caries" and "with caries" groups was calculated using Cohen's d. Most studies demonstrated a large magnitude in the difference between the groups evaluated. The estimate of the effect size confirmed the discriminant validity of the ECOHIS obtained through traditional statistics. Thus, the magnitude of the difference should be considered an important analytical tool for the confirmation of statistical findings regarding null hypotheses and demonstrates the clinical significance of these research results.
authors.affiliation: Universidade Ceuma - Uniceuma, Dentistry Department, São Luís, Maranhão, Brazil.
authors.forename: Meire Coelho
authors.initials: MC
authors.lastname: Ferreira
authors.affiliation: Universidade Federal dos Vales do Jequitinhonha e Mucuri - UFVJM, School of Biological and Health Sciences, Dentistry Department, Diamantina, Minas Gerais, Brazil.
authors.forename: Maria Letícia
authors.initials: ML
authors.lastname: Ramos-Jorge
authors.affiliation: Universidade Federal dos Vales do Jequitinhonha e Mucuri - UFVJM, School of Biological and Health Sciences, Dentistry Department, Diamantina, Minas Gerais, Brazil.
authors.forename: Leandro Silva
authors.initials: LS
authors.lastname: Marques
authors.affiliation: Universidade Federal de Juiz de Fora - UFJF, Department of Basic Sciences, Governador Valadares, Minas Gerais, Brazil.
authors.forename: Fernanda de Oliveira
authors.initials: FO
authors.lastname: Ferreira
mesh_terms: D001938:Brazil; D002675:Child, Preschool; D003731:Dental Caries / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D018401:Sample Size; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires / Q000592:standards*