Table 4: The variables associated with decrease in postoperative lung volumes (in % of the preoperative value), ( ). Univariate analyses.

Independent variablesDependent variables
VCFEV1IC
(95% CI) (95% CI) (95% CI)

Male versus female7.24 (−0.25, 14.7)
Diabetes−9.22 (−18.2, −0.21)*
Airflow obstruction−9.72 (−19.9, 0.51)
Smoker versus no smoker−15.5 (−26.8, −4.20)*
Postoperative weight gain (hyperhydration), kg−1.16 (−2.41, 0.09)
ICU time/4 h0.73 (0.54, 1.00)*

VC: vital capacity, FEV1: forced expiratory volume in 1 second, IC: inspiratory capacity, airflow obstruction: defined as FEV1/VC or FVC < 70% or asthma, smoking (current smoker, smoker versus no smoker or nerver smoked), postoperative weight gain: relation between pre- and second postoperative day, ICU: intensive care unit. * , 0.05–0.10, : regression coefficient, CI: confidence interval.