Distribution of mode of delivery and instrumentation by family history (FH) of hemophilia. ˆKnown FH is associated with lower percentage of vaginal delivery compared with negative FH (65.6% vs 78.9%; P = .0015). ∗Known FH is associated with less instrumentation with vaginal delivery compared with negative FH (3.8% vs 9.2%; P = .0208). P values result from χ² test evaluating FH and the use of vaginal birth and instrumentation. CD, cesarean delivery.