Consanguineous Marriages in the American Population
Consanguineous Marriages in the American Population
George B Louis George Byron Louis Arner
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0 per cent were congenitally blind, of whom 350 or 55. 4 per cent also had blind relatives of the degrees specified. Not counting those who did not answer the question in re- gard to blind relatives, we have 615 cases of which 51. 5 per cent had blind relatives of class (a), and 5. 4 per cent blind relatives of class (b). Taking the 53, 980 blind whose par- ents were not so related the number of congenitally blind was 3666 or but 6. 8 per cent, of whom 1023 or 27. 9 per cent had blind relatives.... Omitting as before the " blind rela- tives not stated, " we have 23. 4 per cent who had blind rela- tives of class (a), and 4. 3 per cent relatives of class (b). On the hypothesis that consanguinity in the parents in- tensifies a tendency toward blindness we should expect to find among the congenitally blind a larger proportion of 62 CONSANGUINEOUS MARRIAGES [404 consanguineous parentage than among thos2 blind from specific causes. In Table XXIII a general classification of the causes of blindness is given together with the consan- gu'nity of parents.
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