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. 2020 Aug 17;8(4):844–851. doi: 10.1007/s40615-020-00842-3

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