F8 gene abnormality Inhibitor-positive Inhibitor-negative Total
(n=24)
p Odds ratio IC 95%
Total of inversions 4 10 14 1 0.93 0.11-8.50
Intron 22 inversion 4 9 13 1 1.18 0.14-10.64
Intron 1 inversion 0 1 1   Undefined  
Point mutations 2 5 7 1 0.96 0.06-8.9
Missense 0 3 3   Undefined  
Polymorphism 1 0 1   Undefined  
Missense+Polymorphism 1 3 4 1 0.77 0.06-9.07
Splice site 0 1 1   Undefined  
Nonsense 1 1 2 0.50 2.66 0.02-222.13
Splice site + nonsense 1 2 3 1 1.25 0.01-28.27
Unknown mutations 2 2 4 0.55 0.33 0.02-6.03
n: number of patient, p: significance, IC: confidence interval
Table 2: Distribution of F8 gene abnormalities in HA patients with and without inhibitors.