Demographics

As of August 29, 2014, the Registry has 9,080 twin pairs (18,160 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: 1.8%
10-19 years old: 4.3%
20-29 years old: 23.8%
30-39 years old: 21.8%
40-49 years old: 13.7%
50-59 years old: 13.2%
60-69 years old: 13.0%
70-79 years old: 5.9%
80+ years old: 2.6%

Ethnicity:
Hispanic/Latino: 3.8%

Race:
White: 88.4%
Asian: 3.3%
Black: 2.4%
American Indian/Alaska Native: 2.1%
Pacific Islander: 0.6%
Other: 2.8%
More than one race: 0.4%

Zygosity:
Identical: 53.7%
Fraternal: 46.3%

Sex:
Male/Male pairs: 28.3%
Female/Female pairs: 49.7%
Male/Female pairs: 22.0%