diagnóstico de sobrepeso em adolescentes: estudo do desempenho de diferentes critérios para o Índice de massa corporal diagnosis of overweight in adolescents aged: comparative study of different criteria for body mass index
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2000
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Abstract
OBJETIVO: Pela simplificação da triagem para obesidade na adolescência, avaliou-se o desempenho de diferentes pontos de corte para o Índice de Massa Corporal (IMC) em uma coorte populacional nascida em 1982, em Pelotas, no sul do Brasil. MÉTODOS: Foram estudados 493 adolescentes, com idades de 15 a 16 anos, residentes na zona urbana de Pelotas, RS. A obesidade foi definida pelo percentil 85 de IMC mais o percentil 90 das dobras cutâneas tricipital e subescapular, conforme a Organização Mundial da Saúde (OMS). Diversos pontos de corte para sobrepeso tiveram sua sensibilidade e especificidade avaliadas. RESULTADOS: Nos meninos, o IMC > ou = 25 kg/m² apresentou sensibilidade superior a 90% e 5% de falso-positivos. O critério proposto para adolescentes brasileiros apresentou sensibilidade de 100%, mas os falso-positivos chegaram a 23%. Nas meninas, os pontos de corte coincidiram, apresentando sensibilidade superior a 90%, com até 13% de falso-positivos. Pontos de corte mais altos foram testados, porém pouco melhoraram a especificidade, que foi acompanhada de redução na sensibilidade. CONCLUSÕES: O IMC > ou = 25 kg/m² mostrou o melhor desempenho na detecção de obesidade, parecendo adequado para triagem de adolescentes de ambos os sexos com 15 anos ou mais. Tem a vantagem de ser único, de fácil determinação e compatível com o ponto de corte recomendado pela OMS para adultos. Dispensa o uso de valores de IMC específicos para idade, sexo e medida de dobras cutâneas, sendo, portanto, recomendável para uso em serviços de saúde.
OBJECTIVE: In an attempt to simplify the screening process for detecting obesity in adolescence, the performance of different cutoff values for body mass index (BMI) was assessed in a population-based cohort in Southern Brazil. METHODS: A total of 493 adolescents aged 15-16 years who lived in the city of Pelotas, Brazil, were studied. Obesity was defined according to the WHO criteria taking into account age and sex (a BMI equal to or greater than the 85th percentile of the NHANES I reference, plus subscapular and triceps skinfold equal to or greater than the 90th percentile of the same reference). Different BMI cutoff values were used to assess their specificity and sensitivity. RESULTS: For boys, BMI > or = 25 kg/m² showed the best performance for detecting obesity, with a sensitivity of 90% and only 5% of false positives. The Brazilian proposed criteria that was used had 100% sensitivity but up to 23% of false positives. Higher cutoff values were also tested, but there was a slight increase in specificity, accompanied by a marked reduction in sensitivity. CONCLUSIONS: The BMI cutoff of 25 kg/m² presented the best performance for screening obesity in the studied sample, and it is recommended for adolescents aged 15 and more in populations with similar characteristics. It provides a single cutoff value to be used in primary health services, eliminating the need for age and sex-specific values and skinfold measurements, and it is also consistent with the cutoff value proposed to identifying overweight adults.
OBJECTIVE: In an attempt to simplify the screening process for detecting obesity in adolescence, the performance of different cutoff values for body mass index (BMI) was assessed in a population-based cohort in Southern Brazil. METHODS: A total of 493 adolescents aged 15-16 years who lived in the city of Pelotas, Brazil, were studied. Obesity was defined according to the WHO criteria taking into account age and sex (a BMI equal to or greater than the 85th percentile of the NHANES I reference, plus subscapular and triceps skinfold equal to or greater than the 90th percentile of the same reference). Different BMI cutoff values were used to assess their specificity and sensitivity. RESULTS: For boys, BMI > or = 25 kg/m² showed the best performance for detecting obesity, with a sensitivity of 90% and only 5% of false positives. The Brazilian proposed criteria that was used had 100% sensitivity but up to 23% of false positives. Higher cutoff values were also tested, but there was a slight increase in specificity, accompanied by a marked reduction in sensitivity. CONCLUSIONS: The BMI cutoff of 25 kg/m² presented the best performance for screening obesity in the studied sample, and it is recommended for adolescents aged 15 and more in populations with similar characteristics. It provides a single cutoff value to be used in primary health services, eliminating the need for age and sex-specific values and skinfold measurements, and it is also consistent with the cutoff value proposed to identifying overweight adults.
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| Authors | ;Paulo Orlando Alves Monteiro;Cesar G Victora;Fernando C Barros;Elaine Tomasi |
| Journal | proceedings - 2016 3rd international conference on information technology, computer, and electrical engineering, icitacee 2016 |
| Year | 2000 |
| DOI |
10.1590/S0034-89102000000500011
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