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Twin registries use a number of strategies to try to reduce the risk of recruitment bias. Some twin registries are "mandatory" - that is, for example, under the public health laws of Norway, all births of twins since 1967 have been recorded in a twin registry maintained by the Norwegian government. [4]
The Vietnam Era Twin Registry (abbreviated VET Registry) is a twin registry containing 7,369 male-male twin pairs who served in the United States Armed Forces during the Vietnam War (defined as the period from 1964 to 1975). As of 2013, it is one of the largest national adult twin samples in the United States. [1]
MTFS is a twin study established in June 1989 with 1300 same-gendered twin pairs age 11 or 17, with an additional cohort of 500 such pairs recruited around 2004. Twins were born between 1972 and 2000. [1] All twins born in Minnesota at that time were eligible to participate using birth registry data.
Triplet and higher multiple births nosedive. In 2004, of the people younger than 35 who gave birth with the help of IVF, 32.7% delivered twins, and 4.9% delivered triplets, according to doctors at ...
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The registry is used to connect researchers to volunteers. [2] [3] [4] It is the largest registry of twin adults in the UK. [5] As of 2013, it hosted information on more than 13,000 volunteer twins, with approximately 50% having completed a baseline comprehensive assessment and more than 70% having completed a detailed health questionnaire.
It includes over 86,000 twin pairs, making it one of the largest twin registries in the world, [1] [2] and it is considered to be representative of the general population of Denmark. [3] It includes biological data and repeated measurements from the same subjects, as well as information from other national registers in Denmark.