INTRODUCTION Caesarean section is thought to be a risk factor for childhood asthma, but this association may be caused by confounding from, for instance, familial factors. To address this problem, we used twin pairs to assess the risk of childhood asthma after emergency caesarean section. METHODS The study was a register-based nation-wide matched cohort study using twin pairs to minimise resi...

OBJECTIVE The study aims to determine the differences in maternal and perinatal outcomes between caesarean and vaginal deliveries and the factors affecting vaginal delivery in twin pregnancy. MATERIALS AND METHODS An observational study to audit twin pregnancies delivered at the University of Nigeria Teaching Hospital between 2002 and 2008. Clinical observations were entered into a questionna...

The Chinese National Twin Registry (CNTR), established in 2001, is the first and largest population-based twin registry in China. Based on the CNTR, a new twin cohort was recruited from 2011 to study the relationship between environmental risk factors and chronic diseases. So far, 33,874 twin pairs from nine provinces have been recruited, in which hundreds of disease-discordant twin pairs and e...

Deformation twins have been reported to produce high strength and ductility. Intersections of deformation twins may affect the microstructural evolution during plastic deformation and consequently influence mechanical properties. However, the mechanisms governing twin-intersection behavior remain poorly understood. In this study, we investigated twin intersection mechanisms by observing twin tr...

The twin reversed arterial perfusion (TRAP) sequence is a rare complication of 1% of monochorionic twin gestation with an incidence of 1 in 35,000 births. One twin is structurally normal while the other is abnormal with development of legs and lower body and undeveloped thorax, head and heart. The abnormal twin also referred as Acardiac monster twin receives its blood supply from normal or the ...

Twins have a high frequency of adverse perinatal events and have been reported to have an increased risk of seizures. Contrary to popular belief, a recent study reported that twins do not have an increased risk of seizures. We studied the relationship of twinning and epilepsy in India. The frequency of twinning in families of probands with epilepsy was compared with the frequency of twinning am...

OBJECTIVE To determine the prevalence and clinical significance of twin births in the Comoros Islands. DESIGN Combined retrospective and non-randomised prospective study. SETTING Hospital El-Ma'aru Moroni Grand-Comoros and Center Medico-Chirurgical Domoni-Anjouan. SUBJECTS One hundred and nine patients with twin deliveries. RESULTS During the period of study, there were 4370 deliveries,...

Callous-unemotional behavior (CU) is currently under consideration as a subtyping index for conduct disorder diagnosis. Twin studies routinely estimate the heritability of CU as greater than 50%. It is now possible to estimate genetic influence using DNA alone from samples of unrelated individuals, not relying on the assumptions of the twin method. Here we use this new DNA method (implemented i...