sitar (version 1.1.2)

who0607: 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

# NOT RUN {
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)
# }