Cribsheet: Multiples
Twins born in 1980: 68,339. In 2003: 128,665.
by Sarah Sundberg
February 8, 2007
Number of live multiple births in the U.S. in 2003: 136,328
Of those, number that were twins: 128,665
Triplets: 7,110
Quadruplets: 468
Quintuplets or higher: 85
Number of twins born in the U.S. in 1980: 68,339
Number of triplets and other high-order births in 1980: 1,337
Twins per 1,000 live births in 2003: 31.5 (roughly 1 in 33)
Twins per 1,000 live births in 1980: 18.9
Proportion of Japanese births in 2000 that were twins: 1 in 120
Of twins in China: 1 in 250
Proportion of twins who are identical: 1/3
Amount of genetic markers shared by identical twins: 100%
Amount of genetic markers shared by fraternal twins: 50%
Amount of genetic markers shared by non-twin siblings: 50%
Chance of an American woman having twins at age 25-29: 3%
Chance of an American woman having twins at age 35-39: 5%
Chance of an American woman having identical twins: 0.4% or 1 in 250
Chance of having conjoined twins: 1 in 50-80,000
Chance of having "natural" triplets: 1 in 8,100
(only about 30% of triplets are "natural")
Chance of having "natural" quads: 1 in 729,000
(only about 6% of quads are "natural")
Chance of having "natural" quints: 1 in 55,000,000
Chance of having twins or higher-order births from fertility treatments: 1 in 3
©2007 Nerve Media
About the Author
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Sarah Sundberg
lives in Brooklyn, where she bikes and explores abandoned buildings. Before that, she lived in Stockholm, Sweden, where she wrote about clubs and music. She has written for Nerve, Surface and indieWIRE. |
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