Table 2.
Characteristics of the included 55 060 vaginal births
| Baseline phase without OASI Care Bundle | Evaluation phase with OASI Care Bundle | All | |
|---|---|---|---|
| Number of births | 27 668 | 27 392 | 55 060 |
| Age (years), median (interquartile range) | 30 (26–34) | 30 (26–34) | 30 (26–34) |
| Age categories (years) | |||
| <25 | 5191 (19.0) | 5177 (19.9) | 10 368 (19.4) |
| 25–29 | 7752 (28.3) | 7597 (29.2) | 15 349 (28.7) |
| 30–34 | 8651 (31.6) | 7998 (30.7) | 16 649 (31.2) |
| >35 | 5771 (21.1) | 5269 (20.2) | 11 040 (20.7) |
| Missing (n = 1654, 3.0%) | |||
| Ethnicity | |||
| White | 18 100 (75.0) | 18 100 (75.9) | 36 200 (75.4) |
| Asian | 2918 (12.1) | 3038 (12.7) | 5956 (12.4) |
| Black | 1271 (5.3) | 1075 (4.5) | 2346 (4.9) |
| Other | 1860 (7.7) | 1640 (6.9) | 3500 (7.3) |
| Missing (n = 7058, 12.8%) | |||
| Body mass index (kg/m2) | |||
| <18 | 945 (3.6) | 728 (3.1) | 1673 (3.4) |
| 18–25 | 13 771 (52.9) | 12 009 (50.7) | 25 780 (51.9) |
| 25–30 | 6700 (25.7) | 6307 (26.7) | 13 007 (26.2) |
| >30 | 4633 (17.8) | 4620 (19.5) | 9253 (18.6) |
| Missing (n = 5347, 9.7%) | |||
| Parity | |||
| Primiparous | 12 662 (46.0) | 12 153 (45.2) | 24 815 (46.5) |
| Multiparous | 14 853 (54.0) | 14 759 (54.8) | 29 612 (55.4) |
| Missing (n = 633, 1.2%) | |||
| Birthweight (g) | |||
| <3500 | 6162 (22.4) | 6243 (23.0) | 12 405 (22.7) |
| 3500–3999 | 10 542 (38.3) | 10 434 (38.4) | 20 976 (38.3) |
| ≥4000 | 10 818 (39.3) | 10 510 (38.7) | 21 328 (39) |
| Missing (n = 351, 0.6%) | |||
| Mode of birth | |||
| Spontaneous | 22 006 (79.5) | 21 651 (79.0) | 43 657 (79.3) |
| Forceps | 3660 (13.2) | 3644 (13.3) | 7304 (13.3) |
| Vacuum‐assisted | 2002 (7.3) | 2097 (7.7) | 4099 (7.4) |
| Episiotomy | 6934 (25.1) | 6719 (24.5) | 13 653 (24.8) |
Data are number or number (%), unless otherwise indicated.