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Forrest plot showing the effect of HBOT on hydroxyproline levels (HP) in normal anastomoses; HBOT − hyperbaric oxygen treatment; SD − standard deviation; IV − inverse variance, Random − random effect, CI − confidence interval; preop − preoperative; Z − Z-test; P – probability; postop – postoperative; Chi2 − chi-square test; I2 − I-square test for heterogeneity; df − degrees of freedom
