Fig. 1From: The impact of national prenatal screening on the time of diagnosis and outcome of pregnancies affected with common trisomies, a cohort study in the Northern NetherlandsFirst prenatal test performed in cases with a common trisomy according to year of birth and maternal age. Abbreviations: PNS1 prenatal screening in first trimester, PNS2 prenatal screening in second trimester, PND prenatal diagnosisBack to article page