Fig. 6From: Serum screening in first trimester to predict pre-eclampsia, small for gestational age and preterm delivery: systematic review and meta-analysisForest plot for PP13 to predict preeclampsia, SGA and preterm delivery: forest Plot showing likelihood ratio of a positive and negative test result with 95Â % confidence intervals (95 % CI) for studies of Placental Protein 13 (PP13) to predict preeclampsia, small for gestational age (SGA) and preterm delivery. * continuous: Likelihood ratio calculated from receiver operating curve analysisBack to article page