نتایج جستجو برای: twin study
تعداد نتایج: 3986958 فیلتر نتایج به سال:
BACKGROUND Despite twinning being common in Africa, few prospective twin studies have been conducted. We studied twinning rate, perinatal mortality and the clinical characteristics of newborn twins in urban Guinea-Bissau. METHODS The study was conducted at the Bandim Health Project (BHP), a health and demographic surveillance site in Bissau, the capital of Guinea-Bissau. The cohort included a...
OBJECTIVE We compared the performance of the 50-g glucose challenge test (GCT) in singleton versus twin pregnancies and investigated the need for adjusting GCT cutoff values for gestational diabetes mellitus (GDM) in twin pregnancies among Korean women. METHODS A retrospective chart review was performed in women who underwent GCT at 24 to 28 weeks' gestation and delivered in our department be...
BACKGROUND Legg-Calvé-Perthes disease (LCPD) is an idiopathic avascular necrosis of the femoral head. Its etiology is poorly understood, although previous studies have implicated low birth weight and possible genetic determinants. The aim of this study was to identify potential birth weight and genetic associations with LCPD. METHODS We extracted all twin pairs from the Danish Twin Registry (...
Seventeen healthy twin pairs (10 monozygotic and seven dizygotic) from the Finnish Twin Cohort Study were examined to study the impact of heredity v environment in the determination of cup-to-disc area ratio. These twins were free from any known eye disease. The cup/disc ratio was determined using stereo photography and a computer assisted analysis technique. The zygosity of all twin pairs was ...
PURPOSE Educational attainment has been proposed as one of the most consistent environmental risk factors associated with myopia. The Genes in Myopia (GEM) twin study is the first myopia twin study to determine the relative genetic contribution in educational attainment as well as assessing the shared genetic and environmental factors between educational attainment and refraction through struct...
BACKGROUND AND PURPOSE Very few cases of intracranial aneurysms (IAs) in twins have been reported. Previous work has suggested that vulnerability to IA formation is heritable. Twin studies provide an opportunity to evaluate the impact of genetics on IA characteristics, including IA location. We therefore sought to examine IA location concordance, multiplicity, and rupture status within affected...
OBJECTIVE The purpose of this study was to determine the long-term neurodevelopmental outcome in children after twin-to-twin transfusion syndrome. STUDY DESIGN Maternal and neonatal medical records of all twin-to-twin transfusion syndrome patients who were admitted to our center between 1990 and 1998 were reviewed. Neurologic and mental development at school age was assessed during a home vis...
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