cdc2000 {sitar} | R Documentation |
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)