Demographics

Adults

As of November 30, 2019, the Registry has 9,221 adult twin pairs (18,442 individuals). 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
18-1920.70.2
20-2920.311.8
30-3915.228.3
40-4912.615.4
50-5913.113.9
60-6911.914.5
70+6.116.0

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: 53.0%
Fraternal: 47.0%

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

Zygosity/Sex:
MZ Male: 18.9%
MZ Female: 34.2%
DZ Male: 9.0%
DZ Female: 16.2%
DZ Male/Female:  21.8%

Kids

As of November 30, 2019, the Registry has 550 juvenile twin pairs (1,100 individuals). 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
4 and younger63.123.0
5 to 924.546.9
10 to 1412.020.3
15 to 170.49.9

Ethnicity:
Hispanic/Latino: 8.4%

Race:
White: 82.4%
Asian: 0.7%
Black: 0.7%
American Indian/Alaska Native: 0.5%
Pacific Islander: 0.7%
Other: 2.4%
More than one race: 12.6%

Zygosity:
Identical: 51.5%
Fraternal: 48.5%

Sex:
Male/Male pairs: 37.5%
Female/Female pairs: 42.4%
Male/Female pairs: 20.2%

Zygosity/Sex:
MZ Male:22.2%
MZ Female: 29.3%
DZ Male: 15.3%
DZ Female: 13.1%
DZ Male/Female:  20.2%


This page was updated 12/5/2019