Demographics

Adults

As of October 28, 2016, the Registry has 9,070 adult twin pairs (18,140 individuals). New pairs are enrolled every month. Below is a detailed breakdown of the Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Age:
18-19 years old: 0.14%
20-29 years old: 19.5%
30-39 years old: 27.3%
40-49 years old: 14.8%
50-59 years old: 13.9%
60-69 years old: 14.5%
70 years or older: 9.8%

Ethnicity:
Hispanic/Latino: 3.7%

Race:
White: 90.7%
Asian: 2.5%
Black: 2.1%
American Indian/Alaska Native: 0.6%
Pacific Islander: 0.4%
Other: 1.3%
More than one race: 2.4%

Zygosity:
Identical: 51.9%
Fraternal: 48.0%

Sex:
Male/Male pairs: 27.9%
Female/Female pairs: 50.2%
Male/Female pairs: 21.9%

Zygosity/Sex:
MZ Male: 18.5%
DZ Male: 9.4%
MZ Female: 33.5%
DZ Female: 16.7%
DZ Male/Female:  21.9%

Kids

As of October 28, 2016, the Registry has 359 youth twin pairs (718 individuals). New pairs are enrolled every month. Below is a detailed breakdown of the Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Age:
4 years old and younger: 44.8%
5-9 years old: 34.7%
10-14 years old: 20.5%

Ethnicity:
Hispanic/Latino: 9.8%

Race:
White: 81.5%
Asian: 0.8%
Black: 0.6%
American Indian/Alaska Native: 0.6%
Pacific Islander: 1.1%
Other: 2.8%
More than one race: 12.5%

Zygosity:
Identical: 48.2%
Fraternal: 51.8%

Sex:
Male/Male pairs: 35.4%
Female/Female pairs: 43.7%
Male/Female pairs: 21.9%

Zygosity/Sex:
MZ Male: 19.2%
DZ Male: 16.2%
MZ Female: 29.0%
DZ Female: 14.8%
DZ Male/Female:  20.9%