Demographics

As of June 24, 2014, the Registry has 8,881 twin pairs (17,762 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: 1.5%
10-19 years old: 3.9%
20-29 years old: 24.7%
30-39 years old: 21.6%
40-49 years old: 13.9%
50-59 years old: 13.4%
60-69 years old: 12.8%
70-79 years old: 5.8%
80+ years old: 2.5%

Ethnicity:
Hispanic/Latino: 3.5%

Race:
White: 88.2%
Asian: 3.3%
Black: 2.1%
American Indian/Alaska Native: 2.3%
Pacific Islander: 0.7%
Other: 2.8%
More than one race: 0.4%

Zygosity:
Identical: 53%
Fraternal: 47%

Sex:
Male/Male pairs: 28.5%
Female/Female pairs: 49.5%
Male/Female pairs: 22.0%