Z Hrubec

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The National Research Council Twin Registry comprises 16,000 pairs of white male twins, both members of which had been in military service, mainly in World War II. All their available military and Veterans Administration records and their responses to a 1965 to 1970 NRC questionnaire have been coded as to disease. Upon review we found 16 cases of multiple(More)
  • R Cederlof, L Friberg, Z Hrubec, M G Allen, W Pollin, Schizophrenia +7 others
  • 2015
Cardiovascular and respiratory symptoms in relation to tobacco smoking. A study on American twins. Pollin, W., et al., Psychopathology in 15,909 pairs of veteran twins: evidence for a genetic factor in the pathogenesis of schizophrenia and its relative absence in psychoneurosis. in twins and the diffuse ego boundary hypothesis. Relationship of(More)
Weinberg's difference method, applied to twin birth statistics, usually shows a dependence of the MZ rate on maternal age, like a thin shadow of the DZ rate. Some of this MZ variation could be explained away by James' finding of more same-sex (SS) than opposite-sex (OS) DZ twins, the excess being mistakenly classified as MZ by Weinberg's assumption of equal(More)
When the Weinberg estimate of the proportion of monozygotic pairs is quite deviant from that in the source population, it is likely to be wrong because Weinberg's difference is much less stable than the zygosity proportions. A formula is proposed for the probability distribution of possible compositions of a small sample of twins based on sex concordance in(More)
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