Episiotomy (%) | Obstetric anal sphincter injuries (%) | Duration of labour >12 hours (%) | Operative vaginal delivery (%) | |||||||||
SUH | NMH | SLO | SUH | NMH | SLO | SUH | NMH | SLO | SUH | NMH | SLO | |
Group 1 | 35.8 | 56.8 | 50.9 | 2.4 | 2.5 | 0.4 | 11.3 | 2.8 | 1.2 | 23.7 | 24.6 | 5.9 |
Group 2a | 40.6 | 46.1 | 45.8 | 3.7 | 2.2 | 0.4 | 9.9 | 5.8 | 1.6 | 31.9 | 23.4 | 7.2 |
Group 2b | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
Group 3 | 7.3 | 8.8 | 20.4 | 0.6 | 1.0 | 0.2 | 2.5 | 0.2 | 0.1 | 3.5 | 2.5 | 0.7 |
Group 4a | 11.8 | 12.2 | 21.8 | 0.6 | 0.6 | 0.2 | 3.4 | 0.4 | 0.2 | 6.7 | 4.9 | 1.3 |
Group 4b | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
Group 5 | 17.9 | 18.7 | 12.1 | 2.4 | 0.6 | 0.1 | 10.1 | 0.1 | 0.2 | 13.8 | 8.3 | 1.7 |
NA, not applicable; SUH, Stavanger University Hospital 2010–2011; NMH, National Maternity Hospital 2011; SLO, Slovenian National Perinatal Database 2007–2011; TGCS, 10-Group Classification System.