Convert postnatal growth measurements for preterm infants to INTERGROWTH z-scores/centiles (generic)

igprepost_value2centile(pmagedays, val, var = "lencm", sex = "Female")

igprepost_value2zscore(pmagedays, val, var = "lencm", sex = "Female")

Arguments

pmagedays: postmenstrual age in days
val: the value(s) of the anthro measurement to convert
var: the name of the measurement to convert ("lencm", "wtkg", "hcircm")
sex: "Male" or "Female"

References

Postnatal growth standards for preterm infants: the Preterm Postnatal Follow-up Study of the INTERGROWTH-21st Project. Villar J, Giuliani F, Bhutta ZA, et al. Lancet Glob Health 2015; 3: e681–91.

Examples

# get centile of 0.99kg 27 week postmenstrual age Male and 0.91kg 27 week
# postmenstrual age Female
igprepost_value2centile(
  27 * 7,
  c(0.99, 0.91),
  var = "wtkg",
  sex = c("Male", "Female")
)
#> [1] 96.89486 97.12034