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• W2028873868 abstract "The distribution of specific defects among 107 sets of twins and 2 sets of triplets with cardiac malformations was found to be similar to that in the general population, but there were no cases of associated Down's syndrome. The mean age for mothers of twins, 27.49 years, was slightly higher than for mothers of all children with cardiac malformations because of the somewhat older age of mothers of dizygotic twins. The mean birth weight of affected twins, 2,198 g, was lower than for twins in general, and was lower for monozygotic than for dizygotic twins, and for affected twins than for their normal monozygotic or dizygotic cotwins. There was a disproportionately high percentage of monozygotic twins (58 percent), same-sex twins (81 percent) and females (62 percent). The concordance rate in monozygotic twins was 6.8 percent (8.2 percent if triplet couplets are included), approximating the 5 to 10 percent rate theoretically expetted on the basis of population and sibship data. For dizygotic twins the concordance rate was 2.3 percent (2.2 percent if triplet couplets are included), essentially the same as for siblings of children with cardiac malformations. Concordance for specificity of cardiac defect was very high in the few monozygotic twins who were concordant for cardiac malformation. A low concordance rate in monozygotic twins does not exclude. a significant role for genetic factors in the etiology of cardiac malformations. The distribution of specific defects among 107 sets of twins and 2 sets of triplets with cardiac malformations was found to be similar to that in the general population, but there were no cases of associated Down's syndrome. The mean age for mothers of twins, 27.49 years, was slightly higher than for mothers of all children with cardiac malformations because of the somewhat older age of mothers of dizygotic twins. The mean birth weight of affected twins, 2,198 g, was lower than for twins in general, and was lower for monozygotic than for dizygotic twins, and for affected twins than for their normal monozygotic or dizygotic cotwins. There was a disproportionately high percentage of monozygotic twins (58 percent), same-sex twins (81 percent) and females (62 percent). The concordance rate in monozygotic twins was 6.8 percent (8.2 percent if triplet couplets are included), approximating the 5 to 10 percent rate theoretically expetted on the basis of population and sibship data. For dizygotic twins the concordance rate was 2.3 percent (2.2 percent if triplet couplets are included), essentially the same as for siblings of children with cardiac malformations. Concordance for specificity of cardiac defect was very high in the few monozygotic twins who were concordant for cardiac malformation. A low concordance rate in monozygotic twins does not exclude. a significant role for genetic factors in the etiology of cardiac malformations." @default.
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• W2028873868 date "1977-06-01" @default.
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• W2028873868 title "Congenital Cardiac Malformations in 109 Sets of Twins and Triplets" @default.
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• W2028873868 doi "https://doi.org/10.1016/s0002-9149(77)80220-8" @default.
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