sitar (version 1.0.4)

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

data(who06)

source

http://www.who.int/childgrowth/en/

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 for each measurement (see LMS2z) are as follows: height (ht), weight (wt), body mass index (bmi), head circumference (head), arm circumference (arm), subscapular skinfold (subscap), and tricep skinfold (tricep).

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')