PGF and Stillbirth: The association between sFlt-1:PlGF ratio cutoffs of greater than 38 and greater than 85 and stillbirth were estimated using Firth penalized logistic regression, with models adjusted using a propensity score incorporating maternal factors.<h4>Results</h4>The analytic sample included 125 participants (mean [SD] age, 22.3 [3.8] years), of whom 39 were included in the stillbirth group and 86 in the live birth control group.