Interactions between opposite-sex dizygotic fetuses and the assumptions of Weinberg difference method epidemiology
C E Boklage, C E Boklage
Abstract
The Weinberg difference method in twin epidemiology may be subject to a major error related to a fundamental assumption that seems not to have been previously questioned. Results presented here indicate that the mortality of like-sex dizygotics (DZs) resembles that of monozygotics (MZs) much more than that of unlike-sex DZs, who are not representative of any other group. Unlike-sex twins enjoy a relative protection from fetal and neonatal mortality and probably from at least one effect of the transient perinatal hypoxia common for second twins. Unlike-sex twins develop, and maintain into adulthood, an intermediate gender phenotype with respect to integration of craniofacial growth.
References
- Hum Hered. 1970;20(1):30-56
- Br J Soc Med. 1952 Jul;6(3):192-6
- Am J Hum Genet. 1970 Nov;22(6):611-29
- Nature. 1971 Jul 23;232(5308):277-8
- N Engl J Med. 1974 Nov 14;291(20):1056-9
- N Engl J Med. 1975 Sep 18;293(12):573-5
- Ann Hum Biol. 1976 Nov;3(6):549-56
- Ann Hum Genet. 1976 Nov;40(2):197-9
- Acta Genet Med Gemellol (Roma). 1976;25:314-6
- Ann Hum Biol. 1975 Oct;2(4):365-78
- Prog Clin Biol Res. 1978;24A:189-99
- Science. 1979 Apr 6;204(4388):89-91
- N Engl J Med. 1979 Jun 28;300(26):1445-8
- Science. 1979 Dec 21;206(4425):1428
- Am J Hum Genet. 1980 Jan;32(1):69-78
- Acta Genet Med Gemellol (Roma). 1979;28(1):41-50
- Acta Genet Med Gemellol (Roma). 1979;28(1):69-71
- Prog Clin Biol Res. 1980;46:437-54
- Prog Clin Biol Res. 1981;69A:155-65
- Prog Clin Biol Res. 1981;69A:71-4
- Acta Genet Med Gemellol (Roma). 1981;30(3):167-87
- Acta Genet Med Gemellol (Roma). 1983;32(2):151-7
- Acta Genet Med Gemellol (Roma). 1984;33(1):87-95
- J Craniofac Genet Dev Biol. 1984;4(2):151-69
- Int J Fertil. 1970 Oct-Dec;15(4):221-5
Source: PubMed