Figure 3.
Predicted hazard ratios of preeclampsia in association with average 8-isoprostane concentration over pregnancy by early pregnancy body mass index (panel 1) or preterm delivery (panel 2).
Predicted values from cox proportional hazards models of preeclampsia in relation to ln-transformed geometric average of 8-isoprostane over pregnancy by categories of visit 1 BMI (panel 1) or preterm delivery (panel 2). Model includes spline term with 3 degrees of freedom for ln-transformed geometric average of 8-isoprostane. Gray polygon represents 95% confidence limits for reference category (BMI <25 kg/m2 or term delivery).