Template:USA Preterm Birth Rate table
From Embryology
| Class | Age | Rate (per 100 births) | |
|---|---|---|---|
| Total preterm | Extremely preterm | Early preterm | Late preterm |
| less than 37 weeks’ gestation | less than 28 weeks’ gestation | less than 34 weeks’ gestation | 34–36 weeks’ gestation |
| 12.7 | 0.8 | 3.6 | 9.0 |
| Data: USA Preterm birth rates national Vital Statistics System, United States, 2007. |
