sitar (version 1.4.0)

cdc2000: The CDC 2000 growth reference

Description

The CDC growth reference (Kuczmarski et al 2000) for height, weight, body mass index and head circumference, fitted by the LMS method and summarised by values of L, M and S by sex from birth to 19 years.

Usage

cdc2000

Format

A tibble with 484 observations on the following 14 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

L.hc

numeric vector

M.hc

numeric vector

S.hc

numeric vector

sex

two-level factor with level 1 male and level 2 female

Details

BMI starts at 2 years, and head circumference stops at 3 years.

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 (hc, cm).

References

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

Kuczmarski RJ, Ogden CL, Guo SS, Grummer-Strawn LM, Flegal KM, Mei Z, Wei R, Curtin LR, Roche AF, Johnson CL. 2000 CDC growth charts for the United States: methods and development. Vital Health Stat, 2002, 11, 246, 1-190.

Examples

data(cdc2000)
## calculate 98th centile for weight in girls from birth to 19 years
round(
  setNames(
    LMS2z(x = 0:19, y = 2, sex = 2, measure = 'wt', ref = 'cdc2000',
      toz = FALSE), 0:19), 1)