| who06 {sitar} | R Documentation |
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
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).
Source
https://www.who.int/toolkits/child-growth-standards
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
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')