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Moderate or severe postoperative pain (NRS 4-1 was associated with an increased risk of anastomotic leakage (OR 1.69, 95% CI 1.21-2.38), as well as reoperation (OR 2.17, 95% CI 1.41-3.32). Severe pain (NRS 8-1 was more strongly related to leakage (OR 2.38, 95% CI 1.44-3.93). These associations were confirmed in multivariable analyses and when reoperation due to leakage was used as an outcome. In this population-based retrospective study on prospectively collected data, increased pain in the post-anaesthesia care unit is an independ