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The median drainage volume at the 1st postoperative day in negative pressure group was 204.89 ± 95.19 mL, while in natural pressure group, it was 141.00 ± 52.19 mL (P = .00. The median total volume of postoperative drainage in negative pressure group was 378.06 ± 117.98 mL, while in natural pressure group, it was 249.32 ± 70.74 mL (P = .00. The median total drainage days between natural pressure group and negative pressure group were obviously different (2.93 ± 0.55 vs 3.51 ± 0.71 days, P = .00. There was no difference in patient