Table 2

Gender information for affected individuals in the 201 ankylosing spondylitis families

Number of affected men/women in a family

Number of families

Families with both affected men and women

94

1/1

60

2/1

17

3/1

1

1/2

8

2/2

3

3/2

1

1/3

2

2/3

2

Families with only affected men

74

1/0

5

2/0

54

3/0

12

4/0

2

5/0

1

Families with only affected women

33

0/1

2

0/2

26

0/3

4

0/4

1

Tsui et al. Arthritis Research & Therapy 2005 7:R513   doi:10.1186/ar1701