LAUSR

This article corrects “Prenatal screening for Down syndrome in twin pregnancies: Estimates of screening performance based on 61 affected and 7302 unaffected twin pregnancies” published in Prenatal Diagnosis in 2018 (volume 38, pages 1079‐1085, article first published online: 26 October 2018) The authors have recognized that there are errors in the published article. Firstly, the nuchal translucency (NT) standard deviations in unaffected singleton pregnancies were specified incorrectly. The log10 NT standard deviation in unaffected singleton pregnancies was 0.0976 at the 11th week of pregnancy and 0.0855 between 12 and 13 weeks and not 0.0963 and 0.0843, respectively, as given in the text of the paper. The correct estimates were used in the statistical calculations. Secondly, although the parameter estimates shown inTable 1 were correct, the NT‐specific likelihood ratios were incorrectly calculated for the unaffected twin in affected dichorionic twin pregnancies. As a result, the estimates of screening performance for dichorionic twin pregnancies and all twin pregnancies in Figure 3 and Tables 3, 4 and