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