The data represents the percentage of births in the U.S. that were preterm births from 2014 to 2016, by plurality. According to the data among women with multiple births, 61.04% had preterm births in 2016.
Singleton births | 7.74 | 7.82 | 8.02 |
Multiple births | 59.99 | 60.3 | 61.04 |