Outcome measures
Maternal and fetal characteristics were retrieved from the electronic
database ViewPoint® Version 5.6.28.56 (General Electric Company,
Solingen, Germany). Data were transferred into a study-excel file sheet,
reviewed for accuracy and made anonymous prior to analyses. Demographic
variables from the study-file sheet were then manually typed into theFMF Stillbirth Risk Calculator, an online tool to assess the risk
for stillbirth based upon either maternal history only or in combination
with first and second trimester measurements
(https://fetalmedicine.org/research/assess/stillbirth).7,
9-18 For the purpose of this study, we
applied the “Maternal history ” setting only. The individual
risk score for each case was given in percent (%) or fractions (1:x)
and was transferred into the study-excel file sheet for further
analyses. The FMF Stillbirth risk score directly correlates with
the degree of risk assessment.