Demographics

As of July 31, 2014, the Registry has 9,011 twin pairs (18,022 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: 1.6%
10-19 years old: 4.1%
20-29 years old: 24.2%
30-39 years old: 21.7%
40-49 years old: 13.7%
50-59 years old: 13.3%
60-69 years old: 12.9%
70-79 years old: 5.8%
80+ years old: 2.6%

Ethnicity:
Hispanic/Latino: 3.9%

Race:
White: 88.4%
Asian: 3.4%
Black: 2.4%
American Indian/Alaska Native: 2.1%
Pacific Islander: 0.6%
Other: 2.7%
More than one race: 0.4%

Zygosity:
Identical: 59.5%
Fraternal: 40.5%

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