Fig. 2From: Clinical performance of non-invasive prenatal served as a first-tier screening test for trisomy 21, 18, 13 and sex chromosome aneuploidy in a pilot city in ChinaThe relation between positive rate and pregnant age for trisomy 21, trisomy 18, and trisomy 13T21: trisomy 21; T18: trisomy 18; T13: trisomy 13; SCA: sex chromosomal aneuploidiesBack to article page