2004–2005 | 2006–2007 | 2008–2009 | 2010–2011 | *p Value | Pooled 2004–2011 | |
---|---|---|---|---|---|---|
Women with first vaginal birth | ||||||
Mean maternal age (SD) (year) | 27.2 (5.2) | 27.4 (5.1) | 27.5 (5.1) | 27.7 (5.2) | ≤0.001 | 27.4 (5.2) |
Mean gestational weeks (SD) | 39.9 (1.7) | 39.9 (1.7) | 40.0 (1.7) | 40.0 (1.7) | 0.08 | 40.0 (1.7) |
Epidural analgesia (%) | 67.6 | 59.7 | 69.9 | 71.3 | ≤0.001 | 67.2 |
Episiotomy (%) | 56.7 | 54.6 | 50.3 | 45.5 | ≤0.001 | 51.7 |
OASIS (%) | 1.3 | 1.5 | 1.5 | 1.7 | ≤0.001 | 1.5 |
OASIS without episiotomy (% (n)) | 1.3 (227) | 1.2 (226) | 1.0 (212) | 1.1 (247) | 0.04 | 1.1 (912) |
OASIS with episiotomy (% (n)) | 1.3 (312) | 1.8 (419) | 2.1 (447) | 2.5 (485) | ≤0.001 | 1.9 (1663) |
Mode of delivery (%) | ||||||
Vaginal spontaneous | 63.4 | 61.5 | 60.9 | 60.5 | ≤0.001 | 61.6 |
Vacuum | 12.7 | 14.4 | 14.9 | 15.0 | 14.3 | |
Breech† | 0.6 | 0.6 | 0.6 | 0.8 | 0.6 | |
Forceps† | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |
Caesarean section† | 23.2 | 23.4 | 23.4 | 23.7 | 23.4 | |
Prior caesarean section (%) | 8.3 | 8.4 | 8.6 | 9.0 | 0.001 | 8.6 |
Mean birth weight (SD) (g) | 3464.2 (494.5) | 3443.4 (495.7) | 3436.9 (492.1) | 3438.4 (490.3) | ≤0.001 | 3445.5 (493.2) |
Women with at least one prior vaginal birth | ||||||
Mean maternal age (SD) | 30.8 (5.1) | 30.8 (5.1) | 30.8 (5.0) | 30.8 (4.9) | 0.11 | 30.8 (5.0) |
Mean gestational weeks (SD) | 39.9 (1.6) | 39.9 (1.5) | 39.9 (1.5) | 39.9 (1.5) | 0.17 | 39.9 (1.5) |
Epidural analgesia (%) | 22.8 | 19.1 | 23.9 | 25.4 | ≤0.001 | 22.9 |
Episiotomy (%) | 10.1 | 8.4 | 6.7 | 5.3 | ≤0.001 | 7.6 |
OASIS (%) | 0.2 | 0.2 | 0.2 | 0.3 | ≤0.001 | 0.2 |
OASIS without episiotomy (% (n)) | 0.1 (62) | 0.1 (70) | 0.2 (80) | 0.2 (98) | 0.15 | 0.2 (310) |
OASIS with episiotomy (% (n)) | 0.3 (17) | 1.2 (53) | 1.2 (46) | 2.1 (61) | ≤0.001 | 1.1 (177) |
Mode of delivery (%) | ||||||
Vaginal spontaneous | 87.9 | 88.1 | 88.3 | 88.1 | ≤0.001 | 88.1 |
Vacuum | 2.1 | 2.4 | 2.4 | 2.7 | 2.4 | |
Breech† | 0.5 | 0.5 | 0.6 | 0.6 | 0.5 | |
Forceps† | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Caesarean section† | 9.5 | 9.1 | 8.7 | 8.6 | 8.9 | |
Prior caesarean section (%) | 5.6 | 5.7 | 5.6 | 5.6 | 0.90 | 5.6 |
Mean birth weight (SD) (g) | 3637.7 (510.8) | 3625.2 (500.9) | 3610.6 (499.3) | 3612.1 (497.9) | ≤0.001 | 3621.1 (502.2) |
*χ2 or analysis of variance (ANOVA) tests.
†Additional information.