Demographics

As of June 30, 2019, the Registry has 9,722 twin pairs (19,444 individuals). New pairs are enrolled on a quarterly basis. Below is a detailed breakdown of the Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Age

Age group% at enrollment% today
9 and younger4.73.8
10-1920.31.7
20-2919.211.7
30-3914.426.8
40-4911.914.6
50-5912.413.0
60-6911.213.7
70+5.714.7

Ethnicity
Hispanic/Latino: 4.0%

Race
One race: 96.9%
White: 90.1%
Black or African American: 2.0%
American Indian or Alaska Native: 0.6%
Asian: 2.4%
Native Hawaiian or Other Pacific Islander: 0.4%
Some other race: 1.4%
Two or more races: 3.1%
White and Black or African American: 0.5%
White and American Indian or Alaska Native: 0.8%
White and Asian: 0.8%
Two or more other races: 1.0%

Zygosity
Identical: 53.0%
Fraternal: 47.0%

Sex
Male/Male pairs: 28.4%
Female/Female pairs: 49.9%
Male/Female pairs: 21.7%

Zygosity/Sex
MZ Male pairs: 19.0%
MZ Female pairs: 33.9%
DZ Male pairs: 9.3%
DZ Female pairs: 16.0%
DZ Male/Female pairs: 21.8%

Where are our members located? 

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