Age distribution in category “both parents unaffected”.

1 The number of patients included in the calculation of morbid risk after applying the Weinberg proband and simple sib method are marked in brackets.2 11 families contained 2 probands. These were included as “secondary cases”, using the proband method.3 Two families contained two probands and one secondary case, the latter was counted twice, using the proband method.4 In three families there were two probands and one sibling with a different psychiatric condition. The latter was included twice, using the proband method.Age distribution in category “both parents unaffected”.