Fig. 5From: Serum screening in first trimester to predict pre-eclampsia, small for gestational age and preterm delivery: systematic review and meta-analysisForest plot for PAPP-A to predict preterm delivery: forest Plot showing likelihood ratio of a positive and negative test result with 95Â % confidence intervals (95 % CI) for studies of Pregnancy- Associated Plasma Protein-A (PAPP-A) to predict preterm delivery. * continuous: Likelihood ratio calculated from receiver operating curve analysisBack to article page