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Table 6 Postoperative complications based on pack-years of smoking before surgery

From: The effect of preoperative smoking cessation and smoking dose on postoperative complications following radical gastrectomy for gastric cancer: a retrospective study of 2469 patients

Variables Non-smokers (n = 1413) Smokers (n = 1056) P value
≤ 20 pack-years (n = 164) 20 to 40 pack-years (n = 522) ≥ 40 pack-years (n = 370)
Complicationsa 143 (10.1%) 13 (7.9%) 72 (13.8%) 65 (17.6%) < 0.001
 Surgical site infection 59 (4.2%) 6 (3.7%) 22 (4.2%) 29 (7.8%) 0.022
 Pulmonary complication 46 (3.3%) 2 (1.2%) 31 (5.9%) 21 (5.7%) 0.005
 Bleeding 12 (0.8%) 3 (1.8%) 4 (0.8%) 5 (1.4%) 0.521
 Others 26 (1.8%) 2 (1.2%) 15 (2.9%) 10 (2.7%) 0.367
 Severity of complicationsb      0.001
  Minor (grade II) 104 (7.4%) 6 (3.7%) 52 (10.0%) 44 (11.9%)  
  Major (grade III or greater) 39 (2.8%) 7 (4.3%) 20 (3.8%) 21 (5.7%)  
  1. aData are number of complications (%), patients may have more than one complications
  2. bBased on the Clavien-Dindo severity classification of surgical complications