Table 1.
Demographic characteristics of all delivering women in the US in 2016
| n = 3,906,088 | % | |
|---|---|---|
| Maternal age | ||
| < 20 | 209,789 | 5.4 |
| 20–24 | 795,200 | 20.4 |
| 25–29 | 1,137,643 | 29.1 |
| 30–34 | 1,100,550 | 28.2 |
| 35–39 | 542,049 | 13.9 |
| 40–44 | 111,877 | 2.9 |
| 45–49 | 8188 | 0.2 |
| > 50 | 791 | < 0.01 |
| Primiparity | 1,220,101 | 31.3 |
| Maternal education | ||
| < 9 years | 130,173 | 3.3 |
| 9–11 years | 401,994 | 10.3 |
| 12 years | 968,332 | 24.8 |
| 13–15 years | 1,117,992 | 28.6 |
| 16 years | 780,299 | 20.0 |
| 18 years | 356,262 | 9.1 |
| 20 years | 101,693 | 2.6 |
| Unknown | 49,343 | 1.3 |
| Race | ||
| White | 2,874,450 | 73.6 |
| Black | 614,305 | 15.7 |
| AIAN | 37,358 | 1.0 |
| Asian | 272,990 | 7.0 |
| NHOPI | 11,263 | 0.3 |
| More than one | 95,722 | 2.5 |
| Singleton | 3,770,012 | 96.5 |
| Smoked during pregnancy (any) | 279,016 | 7.1 |
| Pre-term delivery (< 37 weeks) | 447,621 | 11.5 |
| Mode of delivery | ||
| Vaginal | 2,589,178 | 66.3 |
| VBAC | 74,744 | 1.9 |
| Primary CS | 716,644 | 18.3 |
| Repeat CS | 524,149 | 13.4 |
| Vaginal - unknown prior CS | 801 | < 0.01 |
| CS - unknown prior CS | 367 | < 0.01 |
AIAN American Indian or Alaskan Native, NHOPI Native Hawaiian or Other Pacific Islander, VBAC vaginal birth after cesarean section, CS cesarean section