Maternal characteristics and mode of delivery*
| Characteristic | No. (%) of participants with a previous cesarean delivery n = 197 540 | No. (%) of participants with an elective repeat cesarean n = 138 836 | No. (%) of participants with an attempted VBAC n = 58 704 | Rate of attempted VBAC delivery, % |
|---|---|---|---|---|
| Maternal age,† yr | ||||
| < 20 | 1716 (0.9) | 1084 (0.8) | 632 (1.1) | 36.8 |
| 20–24 | 17 075 (8.6) | 11 063 (8.0) | 6012 (10.2) | 35.2 |
| 25–29 | 46 936 (23.8) | 31 600 (22.8) | 15 336 (26.1) | 32.7 |
| 30–34 | 77 426 (39.2) | 54 267 (39.1) | 23 159 (39.5) | 29.9 |
| ≥ 35 | 54 385 (27.5) | 40 821 (29.4) | 13 564 (23.1) | 24.9 |
| Had hypertension | 7026 (3.6) | 5001 (3.6) | 2025 (3.4) | 28.8 |
| Had diabetes mellitus | 1510 (0.8) | 1191 (0.9) | 319 (0.5) | 21.1 |
| Had labour induction | 7307 (3.7) | 0 (0.00) | 7307 (12.5) | 100.0 |
| Delivery occurred during | ||||
| 2003–2004 | 23 565 (11.9) | 15 832 (11.4) | 7733 (13.2) | 32.8 |
| 2005–2006 | 30 764 (15.6) | 22 037 (15.9) | 8727 (14.9) | 28.4 |
| 2007–2008 | 34 205 (17.3) | 24 572 (17.7) | 9633 (16.4) | 28.2 |
| 2009–2010 | 35 713 (18.1) | 25 406 (18.3) | 10 307 (17.6) | 28.9 |
| 2011–2012 | 36 223 (18.3) | 25 555 (18.4) | 10 668 (18.2) | 29.5 |
| 2013–2014 | 37 070 (18.8) | 25 434 (18.3) | 11 636 (19.8) | 31.4 |
Note: VBAC = vaginal birth after cesarean.
↵* Our study was restricted to women with a parity of 1 who had a previous cesarean delivery and who delivered a singleton at 37 to 43 weeks gestation in the current pregnancy in Canada (excluding Quebec) from 2003 to 2014. Participants with missing values were excluded.
↵† For maternal age, the denominators used were 197 538 (no. of participants with a previous cesarean delivery), 138 835 (no. of participants with an elective repeat cesarean) and 58 703 (no. of participants with an attempted VBAC).