igb_var2zscore: Convert birth measurements to INTERGROWTH z-scores/centiles

In HBGDki/growthstandards: Anthropometric Growth Standard Calculations

Convert birth measurements to INTERGROWTH z-scores/centiles

Description

Convert birth measurements to INTERGROWTH z-scores/centiles

Usage

igb_lencm2zscore(gagebrth, lencm, sex = "Female")

igb_wtkg2zscore(gagebrth, wtkg, sex = "Female")

igb_hcircm2zscore(gagebrth, hcircm, sex = "Female")

igb_wlr2zscore(gagebrth, wlr, sex = "Female")

igb_lencm2centile(gagebrth, lencm, sex = "Female")

igb_wtkg2centile(gagebrth, wtkg, sex = "Female")

igb_hcircm2centile(gagebrth, hcircm, sex = "Female")

igb_wlr2centile(gagebrth, wlr, sex = "Female")

Arguments

gagebrth	gestational age at birth in days
lencm	length(cm) measurement(s) to convert
sex	"Male" or "Female"
wtkg	weight (kg) measurement(s) to convert
hcircm	head circumference (cm) measurement(s) to convert
wlr	weight-length ratio values(s) to convert

Note

For gestational ages between 24 and 33 weeks, the INTERGROWTH very early preterm standard is used.

References

International standards for newborn weight, length, and head circumference by gestational age and sex: the Newborn Cross-Sectional Study of the INTERGROWTH-21st Project Villar, José et al. The Lancet, Volume 384, Issue 9946, 857-868

INTERGROWTH-21st very preterm size at birth reference charts. Lancet 2016 doi.org/10.1016/S0140-6736(16) 00384-6. Villar, José et al.

Examples

# get Male birth length z-scores
# first we need just 1 record per subject with subject-level data
cppsubj <- subset(cpp, !duplicated(cpp$subjid))
cppsubj <- subset(cppsubj, sex == "Male")
igb_lencm2zscore(cpp$gagebrth, cpp$birthlen, sex = "Male")

HBGDki/growthstandards documentation built on Jan. 14, 2024, 4:03 a.m.