Table 3 Identification of risk factors for obstetric anal sphincter injuries (3rd or 4th degree perineal tear)
p | |
|---|---|
Resident’s experience: | |
Resident who performed fewer than 24 forceps deliveries | 0.0041 |
Resident who completed fewer than 2.36 semesters of experience practicing instrumental deliveries | 0.0007 |
Obstetrical factors: | |
Protective effect of episiotomy | < 0.0001 |
Posterior presentation | 0.028 |
Progression of the fetus during the fitting of the first instrument | 0.196 |
Induced labor | 0.98 |
Indication of the operative delivery | 0.12 |
Maternal factors: | |
Protective effect of obesity (BMI ≥ 30) | 0.0013 |
Scarred uterus | 0.97 |
Primiparity | 0.18 |
Fetal factors: | |
Cranial perimeter < 330 mm | 0.03 |
Fetal macrosomia (≥ 4000 g) | 0.10 |
Post-term delivery (≥ 41 weeks of gestation) | 0.17 |