We read, with very much interest, the publication by AKKERMANS et al. [1] in the European Respiratory Journal. In this study they reanalysed data from the first Lung Health Study by forming four groups, based on the forced expiratory volume in 1 s (FEV1)/forced vital capacity (FVC) ,0.70 or ,5th percentile, according to the LMS (lambda, mu, sigma) approach. However, we do have some remarks conc...

cystic fibrosis (cf) is an autosomal recessive disease, which affects many organs as it impairs chloride channel. this study was performed to evaluate growth status and its relationship with some laboratory indices such as cholesterol (chol), triglyceride (tg), albumin and total protein in children with cf referred to pediatrics center. this study was designed as a cross-sectional study in one ...

The CDC growth charts contain 10 smoothed percentiles (between the 3 and 97) of BMI for 24 to 240 month-old children and adolescents [3]. These smoothed estimates were subsequently used to derive lambda (L, the power transformation to achieve normality), mu (M, mean or median) and sigma (S, coefficient of variation) parameters for Cole's LMS method [4,5]. Estimates of these 3 parameters allow t...

Percentile growth curves are often used as a clinical indicator to evaluate variations of children's growth status. In this study, we propose empirical percentile growth curves using Z-scores adapted for Japanese Thoroughbred horses, with considerations of the seasonal compensatory growth that is a typical characteristic of seasonal breeding animals. We previously developed new growth curve equ...

OBJECTIVES Higher than expected small for gestational age (SGA) rates and lower than expected large for gestational age (LGA) rates have been observed. A possible explanation is a leftward shift of percentile curves for birth weight due to a systematic error in plotting birth weight values in charts (ie, plotting weekly mean birth weight data at the beginning of the weeks). Our objectives were ...

BACKGROUND To date, several studies have been published outlining reference percentiles for BMI in children and adolescents. In contrast, there are limited reference data on percent body fat (%BF) in U.S. youth. PURPOSE The purpose of this study was to derive smoothed percentile curves for %BF in a nationally representative sample of U.S. children and adolescents. METHODS Percent fat was de...

A telescopic curve is a certain algebraic curve defined by m − 1 equations in the affine space of dimension m, which can be a hyperelliptic curve and an (n, s) curve as a special case. We extend the addition formulae for sigma functions of (n, s) curves to those of telescopic curves. The expression of the prime form in terms of the derivative of the sigma function is also given.

Liquid-vapor coexistence curves and critical parameters for hard-core 1:1 electrolyte models with diameter ratios lambda = sigma(-)/sigma(+) = 1 to 5.7 have been studied by fine-discretization Monte Carlo methods. Normalizing via the length scale sigma(+/-) = 1 / 2(sigma(+)+sigma(-)), relevant for the low densities in question, both T(*)(c) ( = k(B)T(c)sigma(+/-)/q(2)) and rho(*)(c) ( = rho(c)s...

OBJECTIVE To create gender-specific percentile curves for percent body fat (%BF) by Bio electrical Impedance Analysis (BIA) for screening adiposity and risk of hypertension in Indian children and generate reference curves for percent fat-free mass (%FFM), muscle mass (%LM) and bone mineral content (BMC) by using bioelectrical impedance. DESIGN Secondary analysis of data from previous multicen...

BACKGROUND The aim of the study was to provide the age- and sex-specific percentile values of anthropometric measures for Iranian children and adolescents. METHODS This cross-sectional nationwide survey was conducted on a representative sample of 14,880 school students, selected by multistage random cluster sampling from urban and rural areas of 30 provinces in Iran. Anthropometric measures i...