OBJECTIVE To verify Working Group for Obesity in China (WGOC) recommended body mass index (BMI) classification reference for overweight and obesity in Chinese children and adolescents using the data of 2002 China Nationwide Nutrition and Health Survey. METHODS Pediatric metabolic syndrome (MetS) and abnormality of each risk factor for MetS were defined using the criteria for US adolescents. D...

background: the children’s body composition status is an important indicator of health condition evaluated through their body mass index (bmi). we aimed to provide standardized percentile curves of bmi in a population of iranian children and adolescents. we assessed the nationally representative of sample populations from tehran. materials and methods: a total sample of 14,865 children aged 7-1...

the purpose of this research is to analyze heat waves characteristics in the warm period of the year as a climatic hazard in iran. in this study, the daily maximum temperature is taken at 44 synoptic stations during the period 1981-2010. these temperature values were used to extract the intensity, frequency and duration of heat waves using percentile thresholds of 90, 95, and 98. the results sh...

CONTEXT Waist circumference may offer improved diagnosis of obesity in youth compared with body mass index (BMI), but empirical evidence is limited. OBJECTIVE To compare the ability of BMI percentile using UK reference data and waist circumference percentile using UK reference data to diagnose high fat mass in English children. DESIGN AND METHODS In 7,722 9-10-year-olds (3,809 boys, 3,913 g...

INTRODUCTION Several studies suggested an association between first trimester biochemical markers (PAPP-A and ß-HCG) and infants below 10th percentile. Our goal was to describe this relationship of biochemical markers with small-for-gestational-age fetuses in our population. MATERIAL AND METHODS Retrospective analytic study of 2 035 pregnant women that underwent first-trimester screening in t...

In this paper we obtain a consistent estimator when there exist some measurement errors and multicollinearity in the instrumental variables in a two stage least square estimation of parameters. We investigate the asymptotic distribution of the proposed estimator and discuss its properties using some theoretical proofs and a simulation study. A real numerical application is also provided for mor...

We propose a wavelet based stochastic regression function estimator for the estimation of the regression function for a sequence of pairwise negative quadrant dependent random variables with a common one-dimensional probability density function. Some asymptotic properties of the proposed estimator are investigated. It is found that the estimators have similar properties to their counterparts st...