ukwhoterm | R Documentation |
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 and postnatal age from term birth (see Details) to 20 years.
ukwhoterm
A tibble with 512 observations on the following 15 variables:
numeric vector - postnatal age in years
numeric vector
numeric vector
numeric vector
numeric vector
numeric vector
numeric vector
numeric vector
numeric vector
numeric vector
numeric vector
numeric vector
numeric vector
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 term birth data from the British 1990 growth reference (Cole et al 2011), 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, and term birth corresponds to ages between 37 and
42 weeks gestation, where 40 weeks gestation is 0 years. The conversion 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(ukwhoterm)
## calculate median weight (kg) in girls from 0 to 10 years
v <- LMS2z(x = 0:10, y = 0, sex = 2, measure = 'wt',
ref = 'ukwhoterm', toz = FALSE)
setNames(v, 0:10)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.