Demographics

As of February 19, 2015, the Registry has 9,406 twin pairs (18,812 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:
9 years old and under: 2.1%
10-19 years old: 4.8%
20-29 years old: 22.1%
30-39 years old: 22.4%
40-49 years old: 13.3%
50-59 years old: 13.1%
60-69 years old: 13.3%
70-79 years old: 6.2%
80+ years old: 2.8%

Ethnicity:
Hispanic/Latino: 3.8%

Race:
White: 88.5%
Asian: 3.3%
Black: 2.4%
American Indian/Alaska Native: 2.1%
Pacific Islander: 0.6%
Other: 2.7%
More than one race: 0.4%

Zygosity:
Identical: 53.7%
Fraternal: 46.3%

Sex:
Male/Male pairs: 28.3%
Female/Female pairs: 49.6%
Male/Female pairs: 22.1%