There was no significant association between nuchal fold thickness and gestational age (r = 0.084; P = 0.258). The mean (standard deviation) was 2.2 (0.5) mm and the 95th centile was 3.0 mm.
Conclusions: The 95th centile of nuchal fold thickness measured by transvaginal sonography at 14-16 weeks is 3.0 mm.