Table 3 Multivariate logistic analysis of predictors of postoperative pulmonary complications, wound complications, major adverse events and death, in the derivation group, when controlling for covariates

mIFG score

1.48 (1.37–1.59)

1.32 (1.24–1.41)

1.75 (1.67–1.84)

2.05 (1.79–2.35)

Sex (male)

1.18 (1.00–1.40)

0.94 (0.82–1.07)

1.06 (0.96–1.17)

1.47 (0.99–2.17)

Tracheostomy

1.59 (1.29–1.94)

1.25 (1.05–1.47)

1.58 (1.39–1.80)

1.37 (0.89–1.85)

Free tissue transfer

1.29 (1.06–1.57)

1.52 (1.30–1.78)

1.94 (1.72–2.18)

1.28 (0.84–1.97)

Current smoker

1.08 (0.90–1.28)

1.45 (1.27–1.66)

1.18 (1.06–1.31)

0.78 (0.52–1.19)

Hypertension (medicated)

1.37 (1.16–1.62)

1.32 (0.71–1.93)

1.07 (0.97–1.18)

1.12 (0.84–1.40)

Severe COPD^a

1.94 (1.54–2.44)

1.16 (0.93–1.45)

1.34 (1.14–1.58)

1.82 (1.15–2.87)

Operation time (hour)

1.01 (1.00–1.02)

1.01 (1.00–1.02)

1.01 (1.01–1.02)

1.00 (1.00–1.01)

Age (each year of age ≥ 50)

1.02 (1.01–1.03)

1.00 (1.00–1.01)

1.01 (1.00–1.01)

1.03 (1.01–1.05)