Research Article
Mode of Vaginal Delivery: A Modifiable Intrapartum Risk Factor for Obstetric Anal Sphincter Injury
Table 3
Summary of bivariate analysis results.
| | Variable | Categories | OASI | NO OASI | value |
| | Maternal age | Years | 31.33 (4.95) | 31.02 (5.50) | = 0.541 |
| | Parity | Primipara | 70 (2.9%) | 2324 (97%) | | | Multipara | 27 (1.3%) | 2104 (98.7) |
| | Labor onset | Spontaneous | 75 (2%) | 3622 (98%) | = 0.287 | | Induction | 22 (2.7%) | 807 (97.3%) |
| | Delivery duration | Hours | 6.15 (3.64) | 6.15 (5.04) | = 0.995 |
| | Anesthesia | Without | 8 (1.1%) | 736 (98.9%) | | | With | 89 (2.4%) | 3693 (97.6%) |
| | Type of delivery | Spontaneous | 33 (1.1%) | 3076 (98.9%) | | | Vacuum extraction | 4 (2.7%) | 145 (97.3) | | Forceps | 25 (4.5%) | 528 (95.5%) | | Thierry’s spatulas | 35 (4.9%) | 680 (95.1%) |
| | Assistant | OBGYN | 18 (5.7%) | 298 (94.3%) | | | OBGYN trainee | 63 (2.3%) | 2943 (97.7%) | | Midwife | 4 (1.1%) | 349 (98.9%) | | Midwife trainee | 6 (0.7%) | 822 (99.3%) |
| | Neonatal weight | Grams | 3438.35 (408.40) | 3263.89 (508.93) | |
| | Umbilical cord pH | Umbilical artery | 7.22 (0.074) | 7.23 (0.001) | = 0.181 |
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Categorical variables: number and percentageof cases.
Quantitative variables: mean and standard deviation.
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