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Figure 3 Comparison of F.VIII activity of males affected by the valvular disease (A, 32 ± 9%), heterozygous women (B, 75 ± 26%) and nonaffected members (C, 105 ± 35%). Affected males have a significantly lower F.VIII activity (p < 0.0001) than heterozygous and normal subjects. Heterozygous women have significantly lower F.VIII activity (p < 0.02) than normal subjects.