who06: The WHO 2006 growth standard

Description

The WHO growth standard (WHO 2006) for height, weight, body mass index, circumferences and skinfold thicknesses, fitted by the LMS method and summarised by values of L, M and S by sex from birth to 5 years.

Usage

who06

Arguments

Format

A tibble with 150 observations on the following 23 variables:

years: age from 0 to 5 years
L.ht: numeric vector
M.ht: numeric vector
S.ht: numeric vector
L.wt: numeric vector
M.wt: numeric vector
S.wt: numeric vector
L.bmi: numeric vector
M.bmi: numeric vector
S.bmi: numeric vector
L.head: numeric vector
M.head: numeric vector
S.head: numeric vector
L.arm: numeric vector
M.arm: numeric vector
S.arm: numeric vector
L.subscap: numeric vector
M.subscap: numeric vector
S.subscap: numeric vector
L.tricep: numeric vector
M.tricep: numeric vector
S.tricep: numeric vector
sex: two-level factor with level 1 male and level 2 female

Details

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 short names and units for each measurement (see LMS2z) are as follows: height (ht, cm), weight (wt, kg), body mass index (bmi, kg/m2), head circumference (head, cm), arm circumference (arm, cm), subscapular skinfold (subscap, mm), and tricep skinfold (tricep, mm).

References

World Health Organization. WHO Child Growth Standards: Methods and development: Length/height-for-age, weight-for-age, weight-for-length, weight-for-height and body mass index-for-age. Geneva: WHO; 2006.

Cole TJ, Green PJ. Smoothing reference centile curves: the LMS method and penalized likelihood. Stat Med 1992;11:1305-19.

Examples

Run this code

data(who06)
## calculate z-score for length 60 cm in boys at age 0:12 months
LMS2z(x = 0:12/12, y = 60, sex = 1, measure = 'ht', ref = 'who06')

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