Demographics

Adults

As of April 13, 2015, the Registry has 8,965 adult twin pairs (17,790 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: 1.6%
20-29 years old: 22.9%
30-39 years old: 24.0%
40-49 years old: 13.9%
50-59 years old: 13.8%
60-69 years old: 14.2%
70-79 years old: 6.6%
80 years or older: 3.0%

Ethnicity:
Hispanic/Latino: 3.5%

Race:
White: 88.9%
Asian: 3.3%
Black: 2.3%
American Indian/Alaska Native: 2.1%
Pacific Islander: 0.5%
Other: 2.6%
More than one race: 0.4%

Zygosity:
Identical: 53.9%
Fraternal: 46.1%

Sex:
Male/Male pairs: 28.1%
Female/Female pairs: 50.0%
Male/Female pairs: 21.9%

Zygosity/Sex:
MZ Male: 19.2%
DZ Male: 8.7%
MZ Female: 34.5%
DZ Female: 15.1%
DZ Male/Female:  22.5%

Kids

As of April 13, 2015, the Registry has 500 youth twin pairs (1,000 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: 20.8%
5-9 years old: 20.0%
10-14 years old: 12.6%
15-17 years old: 46.6%

Ethnicity:
Hispanic/Latino: 9.6%

Race:
White: 80.0%
Asian: 4.2%
Black: 3.6%
American Indian/Alaska Native: 2.8%
Pacific Islander: 2.0%
Other: 6.6%
More than one race: 0.8%

Zygosity:
Identical: 51.8%
Fraternal: 48.2%

Sex:
Male/Male pairs: 31.8%
Female/Female pairs: 42.8%
Male/Female pairs: 25.4%

Zygosity/Sex:
MZ Male: 19.0%
DZ Male: 10.8%
MZ Female: 30.4%
DZ Female: 9.8%
DZ Male/Female:  30.0%