Table 1.
Overview for 2014 and 2015 of total births, first births, episiotomy rates, and obstetric anal sphincter injuries (OASIS) rates for both spontaneous vaginal deliveries (SVDs) and operative vaginal deliveries (OVDs) in nulliparous (NP) women
| Hinchingbrooke 2014 |
Hinchingbrooke 2015 |
Poole 2014 |
Poole 2015 |
Combined 2014 |
Combined 2015 |
|
|---|---|---|---|---|---|---|
| Total births | 2,342 | 633 | 4,972 | 1,947 | 7,314 | 2,580 |
| All first births | 991/2,342 (42.3%) | 273 (43.1%) | 2,165 (43.5%) | 885 (45.4%) | 3,156 | 1,158 |
| NP (SVD + OVD) | 726 | 197 | 1,512 | 641 | 2,238 | 838 |
| OASIS in NP (SVD + OVD) | 52/726 (7.1%) | 12/197 (6%); 14% reduction | 107/1,512 (7%) | 37/641 (5.7%); 19% reduction | 159/2,238 (7.1%) | 49/838 (5.8%); 18% reduction; P=0.22 |
| OASIS in all NP | 52/991 (5.2%) | 12/273 (4.4%); 15.4% reduction; P=0.6 | 107/2,165 (4.9%) | 37/885 (4.2%); 16% reduction; P=0.4 | 159/3,156 (5%) | 49/1,158 (4.2%); 16% reduction; P=0.2 |
| Episiotomies in all NP | 289/991 (29.1%) | 83/273 (30%); ns | 503/2,165 (23%) | 238/885 (26.8%) | 792/3,156 (25%) | 321/1,158 (27.7%); 10.8% increase; P=0.08 |
| Episiotomies in NP (SVD + OVD) | 289/726 (39.8%) | 83/197 (42.1%) | 503/1,512 (33.3%) | 238/641 (37.1%) | 792/2,238 (35.3%) | 321/838 (38.3%); 8.5% increase; P=0.14 |
| OVD in NP | 239/991 (24%) | 60/273 (30.4%) | 428/2,165 (19.7%) | 189/885 (21.3%) | 667/3,156 (21.1%) | 249/838 (29.7%) |
| Episiotomies in OVD in NP | 203/239 (85%) | 59/60 (99%); 16.5% increase; ***P=0.003 | 380/428 (89%) | 164/189 (87%) | 583/667 (87.4%) | 223/249 (89.5%) |
| OASIS in OVD in NP | 18/239 (7.53%) | 4/60 (6.66%); 12% reduction; ns | 26/428 (6.07%) | 10/189 (5.29%); 12.8% reduction; P=0.85 | 44/667 (6.5%) | 14/249 (5.6%); 13.8% reduction; P=0.065 |
| OASIS in NP OVDs given episiotomies | 12/203 (5.9%) | 3/59 (5%); 15% reduction; P=1 | 25/380 (6.6%) | 9/164 (5.5%); 16.7% reduction; P=0.7 | 37/583 (6.3%) | 12/223 (5.4%); 14.2% reduction; P=0.7; RR=1.18 |
| OASIS in NP OVDs not given episiotomies | 6/36 (16.7%) | 1/1 (100%) | 1/48 (2%) | 1/25 (4%) | ||
| SVD in NP | 487 | 137 | 1,084 | 452 | 1,571 | 589 |
| OASIS in SVD in NP | 34 (7%) | 8 (5.8%); 17% reduction | 81 (7.47%) | 27 (5.97%); 20% reduction; P=0.32 | 115/1,571 (7.3%) | 35/589 (5.9%); 19% reduction in OASIS |
| OASIS in NP SVDs without episiotomy | 31/401 (7.7%) | 8/113 (7%); 9% reduction | 70/962 (7.27%) | 26/378 (6.87%); 5.5% reduction; ns | 101/1,363 (7.4%) | 34/491 (6.9%) |
| Episiotomies in NP SVDs | 86/487 (17.7%) | 24/137 (17.5%) | 122/1,084 (11.1%) | 74/452 (16.37%); 47% increase; ***P=0.007 | 208/1,571 (13.2%) | 98/589 (16.6%), 26% increase; ***P=0.04 |
| OASIS in NP SVDs given episiotomies | 2/86 (2.3%) | 0/24 (0%); 100% reduction; P=1 | 11/122 (9%) | 1/74 (1.35%); 85% reduction; ***P=0.03 | 13/208 (6.25%) | 1/98 (1%); 84% reduction; P=0.04 |
Notes: All P-values calculated by Fisher’s exact two-tailed test (GraphPad software, Inc., La Jolla, CA, USA). Bold values represent significant results.
Abbreviations: RR, risk ratio; ns, not significant.