Cereda A, Carey JC. The trisomy 18 syndrome. Orphanet J Rare Dis. 2012 Oct 23;7:81. doi: 10.1186/1750-1172-7-81.
It states:
“The prevalence (of Edwards syndrom – chromosome 18 trisomy) at birth is higher in females compared to males (F:M %, 60.4), but this discordance is not present if the sex ratio is calculated among fetuses electively terminated (F:M % 48:51.). Moreover the frequency of fetal loss is higher for males compared to females. Furthermore, liveborn females showed better survival compared to males.”