Table 1 Prevalence of women undergoing labor induction in China
Characteristics | Nulliparas | Multiparas | ||
|---|---|---|---|---|
|  | Proportion of women, %a, n = 4 290 936 | Prevalence of labor induction, % (95% CI)a | Proportion of women, %a, n = 4 635 107 | Prevalence of labor induction, % (95% CI)a |
Maternal age (years) | ||||
  < 25 | 25.7 | 13.6 (10.0–17.2) | 15.8 | 12.5 (7.5–17.5) |
 25–29 | 54.9 | 19.7 (16.1–23.4) | 37.1 | 9.5 (6.6–12.4) |
 30–34 | 15.9 | 22.1 (14.2–29.9) | 29.4 | 11.2 (7.1–15.2) |
  ≥ 35 | 3.5 | 16.7 (8.3–25.1) | 17.7 | 8.3 (6.1–10.5) |
Race | ||||
 Han | 97.3 | 18.4 (14.5–22.4) | 96.2 | 10.3 (7.7–12.9) |
 Other | 2.7 | 17.6 (11.0–24.1) | 3.8 | 8.8 (4.3–13.4) |
Education (years) | ||||
 Less than high school (≤ 9) | 23.0 | 13.4 (8.9–17.9) | 51.5 | 10.4 (7.3–13.5) |
 High school (10–12) | 20.1 | 19.5 (15.3–23.7) | 20.7 | 12.0 (8.0–16.0) |
 College and above (> 12) | 56.9 | 21.2 (16.3–26.0) | 27.8 | 9.9 (7.0–12.8) |
Social health insurance | ||||
 Yes | 67.5 | 20.1 (15.1–25.1) | 55.9 | 11.5 (7.9–15.1) |
 No | 32.5 | 15.3 (12.1–18.5) | 44.1 | 9.0 (6.8–11.1) |
BMI at delivery (kg/m2) | ||||
  < 18.5 | 0.5 | 4.7 (0.3–9.1) | 0.4 | 4.6 (0.0–9.4) |
 18.5–23.9 | 17.0 | 16.6 (12.4–20.9) | 14.1 | 8.3 (5.8–10.9) |
 24.0–27.9 | 41.7 | 17.1 (13.9–20.3) | 37.5 | 10.3 (7.2–13.4) |
  ≥ 28.0 | 29.8 | 20.7 (15.8–25.6) | 31.0 | 8.7 (6.2–11.2) |
 Unknown | 11.0 | 20.7 (13.5–27.8) | 17.0 | 14.4 (9.2–19.7) |
Number of fetuses | ||||
 Singleton | 97.8 | 18.8 (14.7–22.8) | 98.0 | 10.4 (7.7–13.0) |
 Multiple | 2.2 | 3.2 (0.0–6.4) | 2.0 | 3.5 (0.4–6.6) |
Fetal presentation | ||||
 Cephalic | 96.0 | 19.1 (14.9–23.3) | 97.1 | 10.4 (7.8–13.0) |
 Breech or other non-cephalic | 4.0 | 1.7 (0.4–3.0) | 2.9 | 5.2 (0.7–9.7) |
Gestational age at delivery (weeks) | ||||
  < 37 | 7.5 | 18.1 (9.5–26.6) | 7.6 | 18.7 (11.3–26.0) |
  ≥ 37 | 92.5 | 18.6 (14.9–22.3) | 92.4 | 9.6 (7.4–11.8) |
Labor analgesia | ||||
 Yes | 28.8 | 20.3 (12.6–27.9) | 26.6 | 11.6 (7.4–15.8) |
 No | 71.2 | 17.7 (14.6–20.8) | 73.4 | 9.7 (7.6–11.8) |
Hospital level | ||||
 Level 2 | 46.0 | 15.8 (11.4–20.2) | 61.0 | 9.8 (6.6–12.9) |
 Level 3 | 54.0 | 20.6 (15.2–26.0) | 39.0 | 11.0 (6.8–15.1) |