ROC curve of the Pediatric Voice Related Quality-of-Life Survey (P-VRQOL): RESUMO Verificar a eficiência e determinar a nota de corte do instrumento Qualidade de Vida em Voz Pediátrico (QVV-P), bem como as medidas de sensibilidade, especificidade e eficiência. Participaram 230 voluntários, pais/responsáveis de crianças/adolescentes com e sem queixa vocal, de ambos os gêneros, com idade entre 2 e 18 anos, que responderam a versão brasileira validada do QVV-P, cujos três escores (geral, físico e socioemocional) foram analisados pela Receiver Operating Characteristic Curve (curva ROC). As notas de corte, a curva ROC e as medidas de especificidade, sensibilidade e eficiência variaram conforme o escore investigado - geral, físico ou socioemocional. O escore geral apresentou poder discriminatório excelente (eficiência=0,936; especificidade=0,991; e sensibilidade=0,881), o escore socioemocional teve classificação de rendimento razoável (eficiência=0,794; especificidade=0,604; e sensibilidade=0,983), e o escore físico foi um classificador excelente (eficiência=0,918; especificidade=0,946; sensibilidade=0,890). Foram determinadas as seguintes notas de corte e área sob a curva: escore geral- corte=96,25 e AUC=0,98; escore físico- corte=91,68 e AUC=0,97; e escore socioemocional- corte=96,87 e AUC=0,79. O protocolo QVV-P é um classificador excelente e eficiente na discriminação de crianças e adolescentes com e sem queixa vocal. A percepção dos pais/responsáveis quanto à presença de uma alteração na voz de seu filho possibilita a compreensão do comprometimento na qualidade de vida relacionada à voz, em 98% dos casos, principalmente, no que se refere às questões físicas do QVV-P.
ABSTRACT To verify the efficiency and to determine the cutoff values that discriminate children/adolescents with and without vocal complaints, as well as the measures of sensibility, specificity and efficiency of the Brazilian Pediatric Voice-Related Quality-of-Life Survey (P-VRQOL). The participants included 230 parents of children/adolescents of both genders, aged between 2 years and 18 years, with and without vocal complaints that responded the validated Brazilian version of P-VRQOL. The three scores (total, physical and social-emotional) were analyzed by the Receiver Operating Characteristic Curve (ROC curve). The cutoff values, ROC curve and the measures of specificity, sensibility and efficiency varied as the score investigated - total, physical or social-emotional. The total score demonstrated excellent discrimination (efficiency=0.936; specificity=0.991; and sensibility=0.881); the social-emotional score was a reasonable indicator (efficiency=0.794; specificity=0.604; and sensibility=0.983) and the physical score was an excellent sorter (efficiency=0.918; specificity=0.946; and sensibility=0.890). The cutoff values and area under curve were: total score- cutoff=96.25 and AUC=0.98; physical score- cutoff=91.68 and AUC=0.97; social-emotional score cutoff=96.87 and AUC=0.79. The P-VRQOL is an excellent sorter to discriminate children/adolescents with and without vocal complaints. The perception of parents about the presence of vocal problem allows the judge of lower quality of life in 98% of the cases, especially, in P-VRQOL physical domain.
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