1998
DOI: 10.1023/a:1021416112215
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Abstract: The aim of this study was to validate a zygosity questionnaire that can be administered over the telephone. Mothers of same-sexed twins of known zygosity and chronicity between 2 and 31 years of age were interviewed on a nine-item questionnaire. From the answers one unweighted and four weighted indices were computed. As single questions, the mother's opinion and the "two peas in a pod" question differentiated best between monozygotic and dizygotic twins. One independent well-trained observer assessed the zygos… Show more

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Cited by 187 publications
(64 citation statements)
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“…Zygosity was established using physical similarity questionnaires administered to the twins’ primary caregiver (Peeters, Gestel, Vlietinck, Derom, & Derom, 1998), a common method for establishing zygosity in large twin samples. On average, the physical similarity questionnaires used by the MSUTR have accuracy rates of 95% or better (Peeters et al, 1998).…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Zygosity was established using physical similarity questionnaires administered to the twins’ primary caregiver (Peeters, Gestel, Vlietinck, Derom, & Derom, 1998), a common method for establishing zygosity in large twin samples. On average, the physical similarity questionnaires used by the MSUTR have accuracy rates of 95% or better (Peeters et al, 1998).…”
Section: Methodsmentioning
confidence: 99%
“…On average, the physical similarity questionnaires used by the MSUTR have accuracy rates of 95% or better (Peeters et al, 1998). The current study included 351 MZ twin pairs and 473 DZ twin pairs.…”
Section: Methodsmentioning
confidence: 99%
“…Zygosity was established using physical similarity questionnaires administered to the twins’ primary caregiver (Peeters et al ., 1998). On average, the physical similarity questionnaires used by the MSUTR have accuracy rates of 95% or better.…”
Section: Methodsmentioning
confidence: 99%
“…The zigosity questionnaire was used to determine MZ and DZ twins. This questionnaire was proposed by Maia et al (2007), a validated Portuguese version of the Peeters, Van Gestel, Vlietinck, Derom and Derom (1998). Its questions about twin similarity and confusion were responded by either the twins' mother (for those under 18 years of age) or the twins themselves (for those above 18 years of age).…”
Section: Methodsmentioning
confidence: 99%