RCOG guideline Competing risks model
Not included Race
Minor risk factors (>3)
Maternal age ≥35 years Examined but not included in the final model
Conception by IVF Included
Nulliparous Parity included as a protective factor
Body mass index <20 kg/m2 Weight and height included as continuous variables
Body mass index 25-34.9 kg/m2
Smoker 1-10 cigarettes per day Smoking status included
Low fruit intake pre-pregnancy Not available
Previous preeclampsia Included
Pregnancy interval <6 months Included as continuous variable
Pregnancy interval ≥60 months
Major risk factors (>1)
Maternal age >40 years Examined but not included in the final model
Smoker ≥ 11 cigarettes per day Smoking status included
Body mass index ≥35 kg/m2 Weight and height included as continuous variables
Paternal SGA Not available
Maternal SGA Not available
Previous SGA baby Included as continuous variable
Serum PAPP-A <0.4 MoM Not available
Cocaine use Not available
Daily vigorous exercise Not available
Previous stillbirth Included
Chronic hypertension Included
Diabetes with vascular disease Any type of diabetes
Renal impairment Not included in the model
Antiphospholipid syndrome Included as SLE and/or antiphospholipid syndrome
Heavy bleeding Not available
Biophysical markers
UtA-PI >95th percentile UtA-PI included as continuous likelihood
Not included EFW included as continuous likelihood
Not included MAP included as continuous likelihood