Demographics

Adults

As of July 31, 2014, the Registry has 8,631 adult twin pairs (17,262 individuals). New pairs are enrolled every month. Below is a detailed breakdown of the UW Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Age:
18-19 years old: 1.5%
20-29 years old: 25.3%
30-39 years old: 22.6%
40-49 years old: 14.4%
50-59 years old: 13.9%
60-69 years old: 13.5%
70-79 years old: 6.1%
80 years or older: 2.7%

Ethnicity:
Hispanic/Latino: 3.6%

Race:
White: 88.8%
Asian: 3.3%
Black: 2.4%
American Indian/Alaska Native: 2.1%
Pacific Islander: 0.5%
Other: 2.6%
More than one race: 0.4%

Zygosity:
Identical: 59.5%
Fraternal: 40.5%

Sex:
Male/Male pairs: 28.3%
Female/Female pairs: 49.7%
Male/Female pairs: 21.9%

 

Kids

As of July 31, 2014, the Registry has 380 youth twin pairs (760 individuals). New pairs are enrolled every month. Below is a detailed breakdown of the UW Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Age:
4 years old and younger: 26.3%
5-9 years old: 12.6%
10-14 years old: 14.2%
15-17 years old: 46.8%

Ethnicity:
Hispanic/Latino: 9.0%

Race:
White: 79.5%
Asian: 5.2%
Black: 2.0%
American Indian/Alaska Native: 3.0%
Pacific Islander: 2.4%
Other: 6.6%
More than one race: 1.2%

Zygosity:
Identical: 60.4%
Fraternal: 39.6%

Sex:
Male/Male pairs: 31.4%
Female/Female pairs: 43.1%
Male/Female pairs: 25.5%

Where born:
Washington state: 80.3%
California: 5.3%
Oregon: 2.4%
Texas: 1.6%
Elsewhere in the USA: 7.3%
Outside of the USA: 3.1%