who0607 {sitar} | R Documentation |
The WHO 2006 growth standard and WHO 2007 growth reference
Description
The WHO growth standard (WHO 2006) and growth reference (2007) for height, weight and body mass index, fitted by the LMS method and summarised by values of L, M and S by sex from birth to 19 years.
Usage
who0607
Format
A tibble with 486 observations on the following 11 variables:
- years
age from 0 to 19 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
- 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) and body mass
index (bmi, kg/m2).
References
Cole TJ, Green PJ. Smoothing reference centile curves: the LMS method and penalized likelihood. Stat Med 1992;11:1305-19.
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.
de Onis M, Onyango AW, Borghi E, Siyam A, Nishida C, Siekmann J. Development of a WHO growth reference for school-aged children and adolescents. Bull WHO 2007;85:660-7.
Examples
data(who0607)
## calculate 98th centile for BMI in girls from birth to 19 years
round(
setNames(
LMS2z(x = 0:19, y = 2, sex = 2, measure = 'bmi', ref = 'who0607',
toz = FALSE), 0:19), 1)