Table 6

Relationship between site of maximum narrowing in index cases and their affected siblings (⩽2.5 mm)

Site in siblingSite of maximum narrowing in index case, No (%) within index case
IndeterminateSuperiorAxialMedial
Indeterminate2 (3)3 (7)1 (14)
Superior5 (42)19 (26)12 (28)2 (29)
Axial7 (58)48 (66)28 (65)3 (43)
Medial4 (5)1 (14)
Total1273437