Table 3

Incidence of postoperative complications

Before matchingAfter matching
TotalEver-smokersNever- smokersStd. Diff.TotalEver-smokersNever- smokersStd. Diff.
N561 598190 686370 912311 186155 593155 593
All complications152 875 (27.2)55 452 (29.1)97 423 (26.3)0.0626085 224 (27.4)44 782 (28.8)40 442 (26.0)0.06281
GI tract related66 166 (11.8)23 451 (12.3)42 665 (11.5)0.0247136 921 (11.9)18 909 (12.2)18.012 (11.6)0.01853
Wound related32 458 (5.8)12 263 (6.4)20 195 (5.4)0.0424517 931 (5.8)9895 (6.4)8036 (5.2)0.05136
Infectious19 761 (3.5)7808 (4.1)11 953 (3.2)0.0480111 824 (3.8)6296 (4.0)5528 (3.6)0.02092
Renal or endocrine5951 (1.1)2238 (1.2)3713 (1.0)0.019183530 (1.1)1841 (1.2)1689 (1.1)0.00938
Cardiovascular53 393 (9.5)19 611 (10.3)33 782 (9.1)0.0405529.677 (9.5)15 777 (10.1)13 900 (8.9)0.04093
Pulmonary10 015 (1.8)4261 (2.2)5754 (1.6)0.043965931 (1.9)3392 (2.2)2539 (1.6)0.04396
Neurological3325 (0.6)1342 (0.7)1983 (0.5)0.025902001 (0.6)1112 (0.7)889 (0.6)0.01244
  • GI, gastrointestinal; Std. Diff, standardised difference.