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(A) Median centile (adjusted for sex and gestation) in mutation carriers (NM) and non-mutation carriers (NN) (p = 0.86). Error bars show interquartile range. (B) Discordant sib-pair analysis. Those pairs where the father has the mutation are shown as filled circles; those pairs where the mother has the mutation are shown as filled triangles. Median birthweight: NM 3,490 g; NN 3460 g (p = 0.91).
