Demographics

As of June 30, 2021, the Registry has 9,835 twin pairs (19,670 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 younger6.04.1
10-1921.02.5
20-2920.27.8
30-3915.127.8
40-4912.117.0
50-5912.113.5
60-6910.013.5
70+3.613.8

Ethnicity
Hispanic/Latino: 4.2%

Race
One race: 96.7%
White: 89.6%
Black or African American: 1.9%
American Indian or Alaska Native: 0.6%
Asian: 2.6%
Native Hawaiian or Other Pacific Islander: 0.4%
Some other race: 1.5%
Two or more races: 3.3%
White and Black or African American: 0.5%
White and American Indian or Alaska Native: 0.8%
White and Asian: 0.9%
Two or more other races: 1.1%

Zygosity
Identical: 54.0%
Fraternal: 46.0%

Sex
Male/Male pairs: 28.1%
Female/Female pairs: 50.5%
Male/Female pairs: 21.4%

Zygosity/Sex
MZ Male pairs: 19.1%
MZ Female pairs: 34.9%
DZ Male pairs: 8.9%
DZ Female pairs: 15.7%
DZ Male/Female pairs: 21.4%

Where are our members located? 

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