whozr | R Documentation |
Calculate z-scores from LMS tables. Wrappers are provided for use with the
WHO growth standards (0-5 years) and WHO growth references (5-19 years):
see zwa
, zha
, zwh
,
zwl
, zba
, zhca
,
zma
, ztsa
, zssa
.
whozr(y, x, sex, ref, adjust_large_z = FALSE)
y |
Outcome veariable |
x |
Predictor, typically age |
sex |
Sex, coded as "F" and "M" |
ref |
Reference data. A tibble or data.frame with columns named
|
adjust_large_z |
Shrink large z-scores towards +/-3? This is done in the WHO's "R macro" but not mentioned in any of the references above. Should only be used for soft-tissue measures (WAZ, BAZ, ACAZ, TCAZ, WHZ, SSAZ), not for hard-tissue measures (HAZ, HCAZ). |
Cole, TJ (1990) The LMS method for constructing normalized growth standards. European Journal of Clinical Nutrition 44(1), 45-60.
WHO Multicentre Growth Reference Study Group (2006) WHO Child Growth Standards based on length/height, weight and age. Acta Paediatrica 95(S450), 76-85.
de Onis et al. (2007) Development of a WHO growth reference for school-aged children and adolescents. Bulletin of the World Health Organization 85(9), 660-667.
A vector z
of y
-for-x
z-scores
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