igb_zscore2lencm | R Documentation |
Convert INTERGROWTH z-scores/centiles to birth measurements
igb_zscore2lencm(gagebrth, z = 0, sex = "Female")
igb_zscore2wtkg(gagebrth, z = 0, sex = "Female")
igb_zscore2hcircm(gagebrth, z = 0, sex = "Female")
igb_zscore2wlr(gagebrth, z = 0, sex = "Female")
igb_centile2lencm(gagebrth, p = 50, sex = "Female")
igb_centile2wtkg(gagebrth, p = 50, sex = "Female")
igb_centile2hcircm(gagebrth, p = 50, sex = "Female")
igb_centile2wlr(gagebrth, p = 50, sex = "Female")
gagebrth |
gestational age at birth in days |
z |
z-score(s) to convert |
sex |
"Male" or "Female" |
p |
centile(s) to convert (must be between 0 and 100) |
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 99th centile for Male birth weights across some gestational ages
igb_centile2wtkg(168:300, 99, sex = "Male")
# recreate figure from preterm paper
d <- expand.grid(centile = c(3, 50, 97), gage = 168:300)
d$value <- igb_centile2lencm(d$gage, d$centile, sex = "Male")
lattice::xyplot(value ~ gage / 7, groups = centile, data = d, type = "l")
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