Convert mother's gestational weight gain (GWG) measurements to INTERGROWTH z-scores/centiles

Source: R/standard_gwg.R

Convert mother's gestational weight gain (GWG) measurements to INTERGROWTH z-scores/centiles

iggwg_value2zscore(gagedays, val, bmi = NULL)

iggwg_value2centile(gagedays, val, bmi = NULL)

Arguments

gagedays

gestational age(s) in days at which gestational weight gain was measured (must be same length as val)

val

value(s) of the gestational weight gain (kg gained since pregnancy) measurement(s) to convert

bmi

optional value(s) of mother's pre-pregnancy BMI (kg / m^2) to check validity of GWG standard

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 z-score and centile for mother at 17 weeks with 2 kg gestational weight gain
iggwg_value2zscore(17 * 7, 2)
#> Argument 'bmi' not supplied... presuming valid pre-pregnancy BMI.
#> [1] 0.2619521
iggwg_value2centile(17 * 7, 2)
#> Argument 'bmi' not supplied... presuming valid pre-pregnancy BMI.
#> [1] 60.33208