The UK-WHO growth reference for height, weight, BMI and head circumference (see Wright et al 2010), fitted by the LMS method and summarised by values of L, M and S by sex from 26 weeks gestation to 20 years.
A tibble with 542 observations on the following 17 variables:
numeric vector - age in weeks or months - see
three-level factor indicating weeks or months: wkga = gestational weeks, wk = postnatal weeks, mth = postnatal months
numeric vector - age in years
two-level factor indicating the provenance of the data, with levels British1990 and WHO2006
two-level factor with level 1 male and level 2 female
The growth reference combines the birth section of the British 1990 growth reference (Cole et al 2011) from 26 to 42 weeks gestation, the WHO growth standard from 2 postnatal weeks to 4 years, and the British 1990 reference from 4 to 20 years.
Age is measured in years, where 40 weeks gestation is 0 years. The conversion
from weeks gestation to years is:
years = (weeks - 40) * 7 / 365.25.
The L, M and S values for each measurement correspond respectively to the
Box-Cox power, median and coefficient of variation of the distribution by
age and sex (Cole & Green 1992). The measurement short names and units (see
LMS2z) are as follows: height (ht, cm), weight (wt, kg),
BMI (bmi, kg/m2) and head circumference (head, cm).
The values are tabulated in the Excel spreadsheet UK_WHO_preterm.xls provided with the Excel add-in LMSgrowth from https://www.healthforallchildren.com/shop-base/software/lmsgrowth/
Cole TJ, Green PJ. Smoothing reference centile curves: the LMS method and penalized likelihood. Stat Med 1992;11:1305-19.
Cole TJ, Williams AF, Wright CM, et al. Revised birth centiles for weight, length and head circumference in the UK-WHO growth charts. Ann Hum Biol 2011;38:7-11.
Wright CM, Williams AF, Elliman D, et al. Using the new UK-WHO growth charts. BMJ 2010;340:c1140.
data(ukwhopt) ## calculate median birth weight (kg) in girls from 26 to 44 weeks gestation v <- LMS2z(x = (26:44-40) * 7 / 365.25, y = 0, sex = 2, measure = 'wt', ref = 'ukwhopt', toz = FALSE) setNames(v, 26:44)
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