a significant trendP = 0.0011
If syndromal, multiple and chromosomal abnormalities were grouped together under the label “extended,” their proportion compared to unique malformations yield significant differences ( P = 0.014) according to parental mutation status and a significant trend was objectivized ( P = 0.0011) from the first to the fourth group (Table 2 ): Children of deleterious mutation carriers had a 10‐fold risk of “extended” malformation in comparison to the control group.