Demographics

Adults

As of June 30, 2018, the Registry has 9,107 adult twin pairs (18,214 individuals). 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%
20-29 years old: 14.4%
30-39 years old: 28.1%
40-49 years old: 15.2%
50-59 years old: 13.6%
60-69 years old: 14.7%
70 years or older: 13.9%

Ethnicity:
Hispanic/Latino: 3.7%

Race:
White: 90.6%
Asian: 2.5%
Black: 2.0%
American Indian/Alaska Native: 0.6%
Pacific Islander: 0.4%
Other: 1.4%
More than one race: 2.5%

Zygosity:
Identical: 52.1%
Fraternal: 47.9%

Sex:
Male/Male pairs: 27.9%
Female/Female pairs: 50.3%
Male/Female pairs: 21.8%

Zygosity/Sex:
MZ Male: 18.6%
DZ Male: 9.3%
MZ Female: 33.5%
DZ Female: 16.7%
DZ Male/Female:  21.8%

Kids

As of June 30, 2018, the Registry has 439 juvenile twin pairs (878 individuals). 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: 33.3%
5-9 years old: 39.6%
10-14 years old: 19.8%
15-17 years old: 7.3%

Ethnicity:
Hispanic/Latino: 8.9%

Race:
White: 81.5%
Asian: 0.7%
Black: 0.9%
American Indian/Alaska Native: 0.5%
Pacific Islander: 0.9%
Other: 2.5%
More than one race: 12.9%

Zygosity:
Identical: 58.1%
Fraternal: 41.9%

Sex:
Male/Male pairs: 36.7%
Female/Female pairs: 42.6%
Male/Female pairs: 20.7%

Zygosity/Sex:
MZ Male: 24.8%
DZ Male: 11.8%
MZ Female: 33.3%
DZ Female: 9.3%
DZ Male/Female:  20.7%