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. 2015 Aug 24;2015:489267. doi: 10.1155/2015/489267

Figure 2.

Figure 2

The most common complications found were lacerations to different pelvic structures. Simpson forceps (the most employed instrument) had a significant association with vaginal lacerations (p = 0.016), RR of 3.4 (95% CI: 1.15–10.04), OR of 3.93 (95% CI: 1.20–12.84), third degree perineal lacerations (p = 0.02), RR of 2.41 (95% CI: 1.12–5.22), OR of 2.89 (95% CI: 1.16–7.22), fourth degree lacerations (p = 0.012), RR of 4.16 (95% CI: 1.21–14.28), and OR of 4.77 (95% CI: 1.27–17.95). Salas forceps were significantly associated with cervical tears (p = 0.006), RR 4.53 (95% CI: 1.49–13.8), OR 5.71 (CI: 1.46–22.36).