Correction for preterm infants

[zxy1219]

How to set up the correction for preterm infants when calculating SDS or percentile? It seems that we can use the kro.ref. Can you provide a example code? Or shall we set the age of preterm infants as negative values?

[RobbieRECAP]

Hi, I'm not the developer but have used the childsds and kro.ref to calculate Z scores for preterms. I had my gestational age value in weeks so I did (Data$Gestational_Age - 40)/ 52. This gets the age values of your preterms into a negative value in years that childsds can then use.