Twin research : the official journal of the International Society for Twin Studies最新文献_第9页

Familial monozygotic twinning: report of an extended multi-generation family. 家族同卵双胞胎:一个扩展多代家族的报告。

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/136905204774200479

Hanan A Hamamy, Heitham K Ajlouni, Kamel M Ajlouni

引用次数: 14

Trends in triplet stillbirth rates in Japan, 1975-1998. 1975-1998年日本三胞胎死产率趋势。

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/136905204774200505

Yoko Imaizumi, Koichi Nonaka

引用次数: 0

Zygosity Misclassification of Twins at Birth in Japan 日本出生双胞胎的合子性错误分类

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/twin.7.3.228

S. Ooki, Y. Yokoyama, A. Asaka

引用次数: 19

Causal Models of Reading Disability: A Twin Study 阅读障碍的因果模型:一项双胞胎研究

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/twin.7.3.275

Rolando D Tiu, S. Wadsworth, R. Olson, J. Defries

引用次数: 17

Implications of Absence of Measurement Invariance for Detecting Sex Limitation and Genotype by Environment Interaction 缺乏测量不变性对通过环境相互作用检测性别限制和基因型的意义

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/twin.7.3.292

G. Lubke, C. Dolan, M. Neale

{"title":"Implications of Absence of Measurement Invariance for Detecting Sex Limitation and Genotype by Environment Interaction","authors":"G. Lubke, C. Dolan, M. Neale","doi":"10.1375/twin.7.3.292","DOIUrl":"https://doi.org/10.1375/twin.7.3.292","url":null,"abstract":"Abstract Using univariate sum scores in genetic studies of twin data is common practice. This practice precludes an investigation of the measurement model relating the individual items to an underlying factor. Absence of measurement invariance across a grouping variable such as gender or environmental exposure refers to group differences with respect to the measurement model. It is shown that a decomposition of a sum score into genetic and environmental variance components leads to path coefficients of the additive genetic factor that are biased differentially across groups if individual items are non-invariant. The arising group differences in path coefficients are identical to what is known as “scalar sex limitation” when gender is the grouping variable, or as “gene by environment interaction” when environmental exposure is the grouping variable. In both cases the interpretation would be in terms of a group-specific effect size of the genetic factor. This interpretation may be incorrect if individual items are non-invariant.","PeriodicalId":75270,"journal":{"name":"Twin research : the official journal of the International Society for Twin Studies","volume":"7 1","pages":"292 - 298"},"PeriodicalIF":0.0,"publicationDate":"2004-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1375/twin.7.3.292","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66608198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Alternate parameterization for scalar and non-scalar sex-limitation models in Mx. Mx中标量和非标量性别限制模型的交替参数化。

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/136905204774200587

Sarah E Medland

引用次数: 0

Otitis Media: Genetic Factors and Sex Differences 中耳炎:遗传因素和性别差异

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/twin.7.3.239

E. Kvestad, K. Kvaerner, E. Røysamb, K. Tambs, J. Harris, P. Magnus

{"title":"Otitis Media: Genetic Factors and Sex Differences","authors":"E. Kvestad, K. Kvaerner, E. Røysamb, K. Tambs, J. Harris, P. Magnus","doi":"10.1375/twin.7.3.239","DOIUrl":"https://doi.org/10.1375/twin.7.3.239","url":null,"abstract":"Abstract Although genetic factors are recognised as major contributors to otitis media, the presence of sex differences in heritability needs clarification. The aim of this study was to estimate the relative contribution of genetic and environmental effects in otitis media liability with particular focus on sex differences. Data from a cohort of Norwegian twins born between 1967 and 1979 with repeated measures on recurrent childhood otitis media were analysed. Altogether the sample included 4247 twin pairs. The tetrachoric correlations for monozygotic twins were .71 and .65 for males and females respectively. In dizygotic twins the correlations were .35 and .25 for males and females, respectively, and was .34 in opposite sexed pairs. The contribution of genetic and environmental effects was analyzed using structural equation modeling. The best fitting model showed that additive genetic effects explained 72% and 61% of the variance in males and females, respectively. The remaining variance was attributed to individual environmental effects. A model specifying equal heritability estimates for males and females yielded an almost equivalent fit. We found substantial genetic effects for liability to otitis media. There is no evidence that different sets of genes influence liability in males and females, but there may be sex differences in the relative importance of genetic effects.","PeriodicalId":75270,"journal":{"name":"Twin research : the official journal of the International Society for Twin Studies","volume":"7 1","pages":"239 - 244"},"PeriodicalIF":0.0,"publicationDate":"2004-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1375/twin.7.3.239","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66608096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 38

The risk of birth defects in dichorionic twins conceived by assisted reproductive technology. 辅助生殖技术孕育的双绒毛膜双胞胎出生缺陷的风险。

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/136905204774200488

Tomoyuki Kuwata, Shigeki Matsubara, Akihide Ohkuchi, Takashi Watanabe, Akio Izumi, Yoko Honma, Yukari Yada, Hiroaki Shibahara, Mitsuaki Suzuki

{"title":"The risk of birth defects in dichorionic twins conceived by assisted reproductive technology.","authors":"Tomoyuki Kuwata, Shigeki Matsubara, Akihide Ohkuchi, Takashi Watanabe, Akio Izumi, Yoko Honma, Yukari Yada, Hiroaki Shibahara, Mitsuaki Suzuki","doi":"10.1375/136905204774200488","DOIUrl":"https://doi.org/10.1375/136905204774200488","url":null,"abstract":"<p><p>The purpose of this study was to examine whether dichorionic twins conceived by assisted reproductive technology (ART; intracytoplasmic sperm injection [ICSI], in vitro fertilization [IVF], gamete-intrafallopian tube transfer [GIFT]) have a higher risk of birth defects compared to dichorionic twins conceived naturally. We reviewed the medical records of 406 mothers with dichorionic twin pregnancies, who received continuous antenatal care from < or = 20 weeks of gestation and gave birth to infants after > or = 24 weeks of gestation in our institute. Birth defects were diagnosed at the time of hospital discharge according to the International Classification of Diseases, 10th Revision. Occurrence of birth defects was compared between twins conceived by ART and those conceived naturally using logistic regression analysis. Overall, 51 of 812 infants (51/812 = 6.2%) had birth defects. The incidence of birth defects in ART-conceived twins was significantly higher than that of naturally conceived twins with an odds ratio of 6.9 (95% confidence interval [CI] 2.1, 22.5), 3.7 (95% CI 1.2, 12.0), and 4.3 (95% CI 1.4, 14.3) for ICSI, IVF, and GIFT, respectively. The higher frequency of birth defects in ART-conceived twins was still significant after adjusting for higher maternal age in the ART group, with an adjusted odds ratio of 6.7 (95% CI 2.1, 21.9), 3.6 (95% CI 1.1, 11.5), and 3.7 (95% CI 1.2-11.8) for ICSI, IVF, and GIFT, respectively. Dichorionic twins conceived by ART, compared to dichorionic twins conceived naturally, had a much higher risk for birth defects diagnosed at hospital discharge.</p>","PeriodicalId":75270,"journal":{"name":"Twin research : the official journal of the International Society for Twin Studies","volume":"7 3","pages":"223-7"},"PeriodicalIF":0.0,"publicationDate":"2004-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1375/136905204774200488","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"24562722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

The Contribution of Risk Factors to Blood Pressure Heritability Estimates in Young Adults: The East Flanders Prospective Twin Study 风险因素对年轻人血压遗传力估计的贡献:东弗兰德斯前瞻性双胞胎研究

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/twin.7.3.245

M. Zeegers, F. Rijsdijk, P. Sham, R. Fagard, M. Gielen, P. Leeuw, R. Vlietinck

{"title":"The Contribution of Risk Factors to Blood Pressure Heritability Estimates in Young Adults: The East Flanders Prospective Twin Study","authors":"M. Zeegers, F. Rijsdijk, P. Sham, R. Fagard, M. Gielen, P. Leeuw, R. Vlietinck","doi":"10.1375/twin.7.3.245","DOIUrl":"https://doi.org/10.1375/twin.7.3.245","url":null,"abstract":"Abstract The heritability of blood pressure estimated in previous studies may be confounded by the influence of potential blood pressure risk factors. We applied the classical twin design to estimate the contribution of these covariates to blood pressure heritability. The study consisted of 173 dizygotic and 251 monozygotic twin pairs aged 18–34 years, randomly selected from the East Flanders Prospective Twin Survey. In a standardized examination, blood pressure and anthropometry was measured, a questionnaire was completed, and a fasting blood sample was taken. In univariate and bivariate modeling, diastolic and systolic heritability were estimated both unadjusted and adjusted for potential risk factors. Also, covariate interaction was modeled. Bivariate analysis gave heritability estimates of 0.63 (95%CI 0.55–0.59), 0.74 (95%CI: 0.68–0.79), and 0.78 (95%CI: 0.70–0.84) for diastolic, systolic, and cross-trait heritability, respectively. The remaining variances could be attributed to unique environmental influences. These heritability estimates did not change substantially in univariate analyses or after adjustment for risk factors. A sex-limitation model showed that the heritability estimates for women were significantly higher than for men, but the same genetic factors were operating across sexes. Sex and cigarette smoking appeared to be statistically significant interaction terms. The heritability of blood pressure is relatively high in young adults. Potential risk factors of blood pressure do not appear to confound the heritability estimates. However, gene by sex by smoking interaction is indicated.","PeriodicalId":75270,"journal":{"name":"Twin research : the official journal of the International Society for Twin Studies","volume":"86 1","pages":"245 - 253"},"PeriodicalIF":0.0,"publicationDate":"2004-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1375/twin.7.3.245","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66608106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Alternate Parameterization for Scalar and Non-scalar Sex-limitation Models in Mx Mx中标量和非标量性别限制模型的交替参数化

Twin research : the official journal of the International Society for Twin Studies Pub Date : 2004-06-01 DOI: 10.1375/twin.7.3.299

S. Medland

引用次数: 22