Zygosity diagnosis of twins by questionnaire.

Ooki, Syuichi; Yamada, K.; Asaka, Akio; Hayakawa, Kayoko; Shimizu, Tadahiko

doi:10.3861/jshhe.55.227

Cited by 73 publications

(78 citation statements)

References 10 publications

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“…Pairs that gave inconsistent responses were recontacted for clarification. Such questionnaires have been shown to give at least 95% agreement with diagnosis based on extensive blood typing (38,39).…”

Section: Samplementioning

confidence: 99%

Genetic influences on endometriosis in an Australian twin sample

Treloar

O’Connor

et al. 1999

Fertility and Sterility

300

208

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Result(s):Three thousand ninety-six (94%) of the twins and 145 (82%) of the physicians responded to the survey. Two hundred fifteen twins reported endometriosis, for a prevalence rate of .07 among question respondents. Tetrachoric twin pair correlations for self-reported endometriosis (MZ: n ϭ 854 and DZ: n ϭ 493) were r MZ ϭ .46 Ϯ .09 and r DZ ϭ .28 Ϯ .13. When available medical and pathology reports were included, they changed to r MZ ϭ .52 Ϯ .08 and r DZ ϭ .19 Ϯ .16, suggesting that 51% of the variance of the latent liability to endometriosis may be attributable to additive genetic influences. Conclusion(s):These findings support the hypothesis that genes influence liability to endometriosis. (Fertil Steril 1999;71:701-10.

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Section: Samplementioning

confidence: 99%

Genetic influences on endometriosis in an Australian twin sample

Treloar

O’Connor

et al. 1999

Fertility and Sterility

300

208

View full text Add to dashboard Cite

show abstract

“…Pairs giving inconsistent responses were recontacted for clarification. Such procedures have been shown to given at least 95 % agreement with diagnosis based on extensive blood-typing (Martin & Martin, 1975 ;Ooki et al 1990). More recently, a subsample of 198 same-sex pairs who reported themselves to be MZ were typed for 11 independent highly polymorphic markers in the course of an asthma study, with no errors in previous zygosity diagnosis detected (Duffy, 1994).…”

Section: Zygosity Diagnosismentioning

confidence: 99%

Unique genetic and environmental determinants of prolonged fatigue: a twin study

Hickie

Kirk²,

Martin³

1999

Psychol. Med.

104

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“…These items have shown to have at least 95% agreement rate with blood typing (Cederlof et a/., 1961;Kasriel and Eaves, 1976;Magnus et a/., 1983;Martin and Martin, 1975;Ooki et al, 1990). In cases where zygosity was questionable or inconsistent on the basis of the self-report items, cotwins were contacted for further information to determine zygosity.…”

Section: Subjectsmentioning

confidence: 99%

Social contact, social attitudes, and twin similarity

et al. 1996

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The nature of the relationship between social contact and attitude similarity between twins was investigated using longitudinal data from a sample of Australian twins. Earlier research has suggested that social attitudes are not explained solely by shared environment; rather there are both genetic and environmental components that explain variance in social attitudes. Using three types of analyses we investigated the magnitude of the relationship and the direction of causation between attitude similarity and social contact. Longitudinal analysis of within-pair variance by level of contact suggests that attitude similarity leads to contact among the females and that similarity is both genetically and environmentally based. Analyses using a crosslag regression model suggest that similarity causes contact among MZ females. Biometrical analyses indicate differences in direction of causation for males and females. Among females, both genetic and shared environmental parameter estimates could be equated across contact groups, suggesting little relationship between contact and similarity. Among males, findings of smaller estimated heritability in the high-contact group suggest that similarity causes contact. However, an increased estimate of the contribution of shared environmental variance in the highcontact males could additionally suggest that contact leads to similarity.

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Zygosity diagnosis of twins by questionnaire.

Cited by 73 publications

References 10 publications

Genetic influences on endometriosis in an Australian twin sample

Genetic influences on endometriosis in an Australian twin sample

Unique genetic and environmental determinants of prolonged fatigue: a twin study

Social contact, social attitudes, and twin similarity

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