Waist-to-height ratio and its associations with body mass index in a sample of Tuscan children in primary school

Smiian

2020

EUMJ

Introduction. Childhood obesity and associated metabolic comorbidities is a major global health concern. Metabolic syndrome (MS) is a cluster of metabolic abnormalities that confers a substantial increase in cardiovascular disease risk. In the context of the childhood obesity pandemic, a distinct subgroup of youth with obesity less prone to the development of metabolic disturbances, called “metabolically healthy obese” (MHO), recently has come into focus. However, the diagnostic criteria of both conditions are still controversial in children. Therefore, the purpose of our research is to estimate the prevalence of metabolic syndrome and metabolically healthy obesity in school-age boys using international reference standards and to recognize the most sensitive metabolic markers. Materials and methods. This study was carried out at the Ternopil regional hospital (Western Ukraine) and involved randomly chosen 112 boys from rural and urban population; aged 10–17 years (mean ± SD, 14.6 ± 0.25). Height, weight and waist and hip circumferences were measured by standard methods in each patient. Body mass index (BMI, kg/m2), waist-to-height ratio (WtHR), waist-to-hip ratio (WHR) were calculated by common formulas. Obesity was defined as a BMI ≥ 2SD for age and gender. Blood pressure was measured and estimated according to European Society of Hypertension guidelines (2016). Biomarkers of carbohydrate and lipid metabolism were tested. Discussion. The study identified prominent physical and metabolic differences in groups of patients with MHO and manifested MS, as well as in the high-risk group for the realization of MS. As a result of this project, MHO and MS were confirmed in 49.11 % and 9.82 % surveyed boys, respectively. The rest of teenagers (32.14 %) based on metabolic disturbances, formed a cluster of the high-risk realization of MS. Moreover, fasting hyperglycemia and glucose intolerance were identified only in patients with manifested MS in 10.91 % and 5.45 % cases, respectively. It was found that the waist-to-height ratio > 0.5 is an informative test of obesity in general, and the waist-to-hip ratio > 0.9 is a sensitive screening tool for abdominal obesity in boys in our population. Based on the results, the triglyceride index is the most sensitive biomarker of insulin resistance compared to triglyceride-to-high density lipids cholesterol ratio and atherogenic coefficient in school-age boys. The results can be applied in pediatric practice for early identification of patients with metabolically unhealthy obesity with WHR and the triglyceride index at the early preclinical stage of MS manifestation. Keywords children, metabolically healthy obesity, metabolic syndrome, triglyceride index.

Section: вступunclassified

Metabolically Healthy and Unhealthy Obesity in Children From the Point of View of Evidence-Based Medicine

Smiian

2020

EUMJ

Rev. bras. ciênc. Saúde

“…Os pontos de corte utilizados foram: percentil menor que três para déficit de peso; percentil ente três e 85 para eutróficos; e percentil e" 85 para risco ou excesso de peso 16,17 . Para a avaliação da CA, foi utilizado os pontos de corte propostos por Taylor et al 18 . Crianças acima do percentil 80, de acordo com a idade e o sexo, foram classificadas com valor de CA elevado.…”

Section: Materiais E Métodosunclassified

Prevalência de Sobrepeso e Obesidade em Pré-Escolares do Município de Frei Paulo-SE: Um Estudo Longitudinal

LINS¹,

OLIVEIRA²,

LIMA³

et al. 2018

RESUMOObjetivos: Avaliar o perfil antropométrico de pré-escolares de quatro a seis anos da Escola Municipal Juvina Moreira, em Frei Paulo-SE. Materiais e métodos: Trata-se de um estudo longitudinal que acompanhou 42 crianças durante seis meses, no qual foram realizadas duas coletas de dados antropométricos. Os dados de peso e altura foram avaliados segundo os percentis propostos pela Organização Mundial da Saúde para o Índice de Massa Corporal. Os pontos de corte utilizados foram: percentil menor que três para déficit de peso; percentil entre três e 85 para eutróficos; e percentil e" 85 para risco ou excesso de peso. Para análise estatística foi utilizado o programa Graph Pad Prism V.5.0. O teste de Mann Whitney foi usado para comparação entre duas variáveis e o coeficiente de Spearman para correlação entre o índice CA/altura e o escore-Z do IMC. O nível de significância adotado foi de 5%. Resultados: Das 42 crianças que participaram do estudo, 18 (42,86%) foram do sexo feminino e 24 (57,14%) do sexo masculino. No primeiro semestre, 26,19% dos pré-escolares foram classificados com risco de sobrepeso ou excesso de peso (sobrepeso ou obesidade). No segundo semestre, esse número caiu para 16,67%. A prevalência de circunferência alterada se manteve em 19% nos dois semestres, e foi encontrada uma correlação positiva entre a relação circunferência abdominal por altura e o escore-z do Índice de Massa Corporal. Conclusão: Percebeuse que as taxas de sobrepeso e obesidade nos pré-escolares de Frei Paulo são relevantes e compatíveis com o encontrado em outras regiões do Brasil. Apesar da redução dessas taxas no segundo semestre, os números evidenciam a necessidade de intervenção nessa população através da educação e promoção da saúde.

“…While WC and WHR have been considered as measures for abdominal or central obesity, BMI has been considered as a measure for general obesity. Waist-to-height ratio (WHtR) [ 16 ] and neck circumference (NC) [ 17 ], as well as mid-upper arm circumference (MUAC) [ 18 ], have also been suggested as being useful assessment tools for childhood obesity. Age- and sex-specific BMI percentile curves (pBMI) are the most frequently used measures for obesity screening in children of all ages, while WC and WHtR are specific for assessing abdominal fat in children [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Anthropometric Indices for Optimal Cut-Offs for Obesity Screening in a South African Adolescent Population

Engwa

Schmid‐Zalaudek

Chungag³

et al. 2021

Biology

The assessment of obesity in sub-Saharan Africa relies on cut-offs established from western populations. This study assessed anthropometric indices to determine optimal cut-off values for obesity screening in the South African adolescent population. A cross-sectional study involving 1144 (796 females and 348 males) adolescents aged 11–17 years from the Eastern Cape Province of South African was conducted. Anthropometric parameters were measured. Receiver operating characteristic (ROC) analysis was performed to assess the sensitivity and specificity of obesity screening tools and establish cut-offs. The optimal cut-offs for obesity in the cohort using waist-to-height ratio (WHtR) as reference were: neck circumference (NC) = 30.6 cm, mid-upper arm circumference (MUAC) = 25.9 cm, waist circumference (WC) = 75.1 cm, hip circumference (HC) = 92.15 cm and body mass index percentile (pBMI) = p85.2th. The new pBMI cut-off value at p85.2th improved the sensitivity of the test by approximately 30% compared to the CDC recommended BMI percentile (pBMIr) of p95.0th. When pBMI was used as reference, the optimal cut-offs in the cohort were: WHtR = 0.481, NC = 30.95 cm, MUAC = 27.95 cm, WC = 76.1 cm and HC = 95.75 cm. The WHtR optimal cut-off of 0.481 was close to the recommended cut-off value of 0.5. The predicted prevalence of obesity obtained using cut-offs from ROC analysis was higher than those from recommended references. All cut-off values for the various anthropometric measures generally increased with age for all percentile ranges. This study reveals a lower pBMI cut-off value, different from the CDC recommended cut-off, for screening obesity in a South African adolescent population. The study has established that the optimal pBMI cut-off for obesity screening may be ethnic-specific.