We report on two cases of prehospital initiated precipitated preterm deliveries with breech presentation, which were completed at the hospital. Case 1 involved a precipitated breech delivery in a multipara, and case 2 an unrecognizeddizygotic (diamniotic, dichorionic) twin pregnancy, with precipitated preterm breech delivery of the first twin, in a multipara.

Happiness and Genes Many scientists have argued that they can determine to what extent human happiness levels are controlled by genes by comparing the average happiness levels of identical twins raised apart. If we discover that identical twins raised apart tend to be more hedonically similar than fraternal twins raised apart, this is interpreted as evidence for the thesis that genes have a str...

As the standard iris biometric algorithm “sees” them, the left and right irises of the same person are as different as irises of unrelated people. Similarly, in terms of iris biometric matching, the eyes of identical twins are as different as irises of unrelated people. The left and right eyes of an individual or the eyes of identical twins are examples of genetically identical irises. In exper...

This study is one which answers many of Dr. Rosenthal's criticisms of earlier work, and in part, it may be seen as an outgrowth of them. Dr. Kringlen's study is in the fine Scandinavian epidemiologic tradition. In addition, his research zeal is apparent in his search for the twins. As would be predicted from the Rosenthal paper, Dr. Kringlen finds much lower concordance rates for schizophrenia ...

STUDY DESIGN Clinical, radiological, and genetic determination of zygosity of twin pairs from the Danish Twin Registry who self-reported having adolescent idiopathic scoliosis (AIS). OBJECTIVE To establish concordance rates of AIS. SUMMARY OF BACKGROUND DATA The etiology of and the true mode of inheritance of AIS remain unclear. Studies on concordance in twin pairs provide a basis for analy...

PURPOSE Axial length has been shown to explain up to 50% of the total variance in refraction, with axial length and refraction having a major genetic component. However, no study has attempted to determine whether the correlation between axial length and refraction is explained by shared genetic or environmental factors. METHODS All twins from Victoria aged 18 years or older were invited to p...

AIM To quantify the level of risk for stillbirth and infant death in singleton compared with twin pregnancies, using national data; to determine the independent effects of zygosity, sex, and birthweight on these risks in twin pregnancies. METHODS A retrospective national study was carried out of all singleton and twin birth and death registrations in England and Wales 1982-91, according to se...

BACKGROUND Individuals with early warning signs of life-long psychopathy, callous-unemotional traits (CU) and high levels of antisocial behaviour (AB) can be identified in childhood. We report here the first twin study of high levels of psychopathic tendencies in young children. METHODS At the end of the first school year, teachers provided ratings of CU and AB for 3687 twin pairs from the Tw...

The power to detect sources of genetic and environmental variance varies with sample size, study design, effect size and the statistical significance level chosen. We explored whether the power of the classical twin study may be increased by adding non-twin siblings to the classical twin design. Sample sizes to detect genetic and shared environmental variation were compared for kinships with on...