Demographics
Adults
As of November 1, 2022, the Registry has 9,260 adult twin pairs (18,520 individuals). Below is a detailed breakdown of the Twin Registry population, calculated from the survey that twins complete when they join the Registry.
| Adult Age Group | % at Enrollment | % Today |
|---|---|---|
| 18–19 | 20.7 | 0.0 |
| 20–29 | 20.4 | 6.7 |
| 30–39 | 15.2 | 29.6 |
| 40–49 | 12.6 | 19.1 |
| 50–59 | 13.1 | 14.5 |
| 60–69 | 11.9 | 14.6 |
| 70+ | 6.0 | 15.6 |
Ethnicity
Hispanic/Latino: 3.7%
Race
White: 90.5%
Asian: 2.5%
Black: 2.0%
American Indian/Alaska Native: 0.6%
Pacific Islander: 0.4%
Other: 1.4%
More than one race: 2.6%
Zygosity
Identical: 53.2%
Fraternal: 46.8%
Sex
Male/Male pairs: 27.8%
Female/Female pairs: 50.5%
Male/Female pairs: 21.7%
Zygosity/Sex
MZ Male: 18.8%
MZ Female: 34.4%
DZ Male: 9.0%
DZ Female: 16.1%
DZ Male/Female: 21.7%
Youth
As of November 1, 2022, the Registry has 611 juvenile twin pairs (1,222 individuals). Below is a detailed breakdown of the Twin Registry population, calculated from the survey that twins complete when they join the Registry.
| Youth Age Group | % at Enrollment | % Today |
|---|---|---|
| 4 and younger | 67.3 | 13.3 |
| 5 to 9 | 25.9 | 47.6 |
| 10 to 14 | 6.9 | 30.3 |
| 15 to 17 | 0.0 | 8.8 |
Ethnicity
Hispanic/Latino: 7.9%
Race
White: 81.8%
Asian: 1.3%
Black: 1.1%
American Indian/Alaska Native: 0.5%
Pacific Islander: 0.5%
Other: 1.8%
More than one race: 12.9%
Zygosity
Identical: 54.2%
Fraternal: 45.8%
Sex
Male/Male pairs: 40.9%
Female/Female pairs: 40.4%
Male/Female pairs: 18.7%
Zygosity/Sex
MZ Male: 25.2%
MZ Female: 29.0%
DZ Male: 15.7%
DZ Female: 11.5%
DZ Male/Female: 18.7%