igb_lencm2zscore | R Documentation |
Convert birth measurements to INTERGROWTH z-scores/centiles
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")
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 |
For gestational ages between 24 and 33 weeks, the INTERGROWTH very early preterm standard is used.
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.
# 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")
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