Convert INTERGROWTH z-scores/centiles to gestational weight gains (GWG)

iggwg_zscore2value(gagedays, z = 0, bmi = NULL)

iggwg_centile2value(gagedays, p = 50, bmi = NULL)

Arguments

gagedays: gestational age(s) in days
z: z-score(s) to convert
bmi: optional value(s) of mother's pre-pregnancy BMI (kg / m^2) to check validity of GWG standard
p: centile(s) to convert (must be between 0 and 100)

References

Gestational weight gain standards based on women enrolled in the Fetal Growth Longitudinal Study of the INTERGROWTH-21st Project: a prospective longitudinal cohort study Ismail, Leila Cheikh et al. BMJ 2016;352:i555

Examples

# get value for median GWG for mother at 40 gestational weeks
iggwg_centile2value(40 * 7, 50)
#> Argument 'bmi' not supplied... presuming valid pre-pregnancy BMI.
#> [1] 13.6927