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OBJECTIVE: to assess the accuracy of the Capurro somatic and ultrasound methods, taking date of last menstruation as a reference point, for evaluating gestational age and anthropometric classification of term newborns. METHODS: a prevalence study was carried out involving 309 pregnant women and their term newborns, 92 of whom were small for gestational age and 217 appropriate sized for gestational age, at two public maternity hospitals in the Brazilian city of Salvador. The evaluation of the differences between the median gestational age according to the two methods was carried out using the non-parametric "Wilcoxon Signed-Rank Test." The accuracy of the methods for evaluating gestational age for the small for gestational age newborns was estimated by calculating the sensitivity, specificity, positive predictive value, negative predictive value and ROC (Receiver Operating Characteristic) curve. RESULTS: compared to ultrasound, the Capurro method overestimated the gestational age in newbornsof less than 39 weeks and underestimated it in older newborns. Ultrasound underestimated gestational agein newborns with more than 37 weeks. CONCLUSION: ultrasound was found to have greater sensitivity for prediction of small for age newborns (96.6%), while the Capurro method presented greater specificity (75.5%). The highest accuracy was obtained using ultrasound in the 41st gestational week (ROC=77.0%). OBJETIVOS: avaliar a acurácia dos métodos físico de Capurro e da ultrassonografia (USG), tomandocomo referência o método da data da última menstruação (DUM), na avaliação da idade gestacional e classificação antropométrica de recém-nascidos (RN) a termo. MÉTODOS: estudo de prevalência, envolvendo 309 puérperas e seus recém-nascidos a termo, sendo 92 pequenos para idade gestacional (PIG) e 217 adequados para idade gestacional (AIG), de duas maternidades públicas de Salvador. A avaliação das diferenças entre as medianas da idade gestacional segundo os métodos foi realizada utilizando-se o teste não paramétrico "Wilcoxon Signed-Rank Test." A acurácia dos métodos na avaliação da idade gestacional para o diagnóstico de RN PIG foi verificada através do cálculo da sensibilidade, especificidade, valor preditivo positivo, valor preditivo negativo e curva ROC (Receiver Operating Characteristic). RESULTADOS: comparado à ultrassonografia, o método de Capurro superestimou a idade gestacional em recém-natos menores de 39 semanas e substimou a naqueles acima deste patamar. A USG substimou aidade gestacional em recém-nascidos com mais de 37 semanas. CONCLUSÕES: na predição de RN PIG, maior sensibilidade foi observada para a USG (96,6%) e maior especificidade para o Capurro (75,5%). Melhor acurácia foi observada para a USG na 41ª semana gestacional (ROC=77,0%)

revista brasileira de saúde materno infantil

Estimating gestational age and its relation to the anthropometric status of newborns: a study comparing the Capurro and ultrasound methods with last menstrual period