نتایج جستجو برای: twins
تعداد نتایج: 13853 فیلتر نتایج به سال:
The increasing rates of preterm birth among twins implicate that solid data on associated risks and outcomes are required. Assessment of zygosity is often based on clinical criteria (evaluation of placenta; same gender, birth weight discordance as surrogate criteria for monochorionic/monozygotic twins). The aim of this study was to compare clinical versus genetic assessment of zygosity and to c...
OBJECTIVE To test the validity of the fetal origins hypothesis and the classic twin method. DESIGN Follow up study of pairs of same sex twins in which both twins survived to age 6. SETTING Denmark. SUBJECTS 8495 twin individuals born 1870-1900, followed through to 31 December 1991. MAIN OUTCOME MEASURES Mortality calculated on a cohort basis. RESULTS Mortality among twins and the gene...
The association of birth type (single vs. double) and pregnancy type (single vs. double) with lactation performance and lactation curve was investigated in Holstein cows in Iran. Data of 243298 lactations on 138021 cows in 261 herds collected during January 2000 to December 2012 were used. The average twinning rate was 3.64% and ranged from 1.44% (primiparous) to 5.41% (multiparous). Factors as...
OBJECTIVE Monozygotic twins are usually discordant (only one twin affected) for type 1 diabetes. Discordance for disease between such twins implies a role for nongenetically determined factors but could also be influenced by a decreased load of diabetes susceptibility genes. The aim of this study was to determine whether two susceptibility genes were less prevalent in discordant twins compared ...
BACKGROUND Atrial fibrillation (AF) is a common arrhythmia. Several studies have shown association of genetic variants with AF and that familial AF increases the risk of AF. We have previously shown a substantial heritability of AF in a twin study. The objective of this study was to determine whether having a co-twin with AF influences mortality. METHODS AND RESULTS We identified all Danish t...
Conjoined twins are twins whose bodies are anatomically joined in utero. The degree to which the twins are attached can range from simple, involving skin and cartilage, to complex, including fusion of the skull(s), brain(s), or other vital organs. There are more than a dozen classifications of conjoined twins [3] but what they all tend to have in common is the sharing of the chorion [4], placen...
Conjoined twins are twins whose bodies are anatomically joined in utero. The degree to which the twins are attached can range from simple, involving skin and cartilage, to complex, including fusion of the skull(s), brain(s), or other vital organs. There are more than a dozen classifications of conjoined twins [3] but what they all tend to have in common is the sharing of the chorion [4], placen...
Background: The aim of this survey was to evaluate the prevalence of some perinatal complications in birth weight discordance (BWD) among twin pregnancies.Methods: In a descriptive analytical cross-sectional study, 490 twin neonates (245 twin pregnancies) born at Mirzakoochakkhan Hospital from 1999 to 2003 were evaluated. Maternal and neonatal data of each delivery were collected for BWD, gesta...
A trend toward greater body size in dizygotic (DZ) than in monozygotic (MZ) twins has been suggested by some but not all studies, and this difference may also vary by age. We analyzed zygosity differences in mean values and variances of height and body mass index (BMI) among male and female twins from infancy to old age. Data were derived from an international database of 54 twin cohorts partic...
BACKGROUND Birth weight percentiles by gestational age are important for assessing prenatal growth and predicting postnatal outcomes of newborns. Several countries have developed nation-specific birth weight references for twins, but China still lacks such references. METHODS AND RESULTS Birth weight data for twins born between October 2006 and September 2015 were abstracted from the China Na...
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