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References: (1) B. Havald and M. Hauge, U.S. Public Health Service Publication 1103 (pp. 61-67), 1963. (2) B. Havald and M. Hauge, Genetics and the Epidemiology of Chronic Diseases, U.S. Departement of Health, Education, and Welfare, 1965. (3) J. S. Lawrence, Annals of Rheumatic Diseases 26(1970):357-379. (4) G. C. Ebers et al, American Journal of Human Genetics 36(1984):495.

References: (1) B. Havald and M. Hauge, U.S. Public Health Service Publication 1103 (pp. 61-67), 1963. (2) B. Havald and M. Hauge, Genetics and the Epidemiology of Chronic Diseases, U.S. Departement of Health, Education, and Welfare, 1965. (3) J. S. Lawrence, Annals of Rheumatic Diseases 26(1970):357-379. (4) G. C. Ebers et al, American Journal of Human Genetics 36(1984):495.

Less 20-24 25-29 30-34 35-39 40 and than 20 over

Age of mother

I 6.12 Older women tend to have more dizygotic twins than do younger women. Relation between the rate of dizygotic twinning and maternal age.

[Data from J. Yerushalmy and S. E. Sheeras, Human Biology 12:95-113, 1940.]

Concordance

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