Table 3

Results from the two hierarchical multivariate linear regression analyses with preoperative fatigue and postoperative fatigue (at 5-month follow-up) were used as dependent variables (n=196)

	Preoperative fatigue			Postoperative fatigue
	Beta	β	P value	Beta	β	P value
Sociodemographics
Age	−0.04	−0.14	0.13	−0.02	−0.07	0.26
Sex	−0.39	−0.10	0.16	0.03	0.01	0.93
Explained variance (R²)		5.5%	0.01		2.9%	0.10
Clinical variables
FEV₁	−0.00	−0.05	0.63	−0.00	−0.03	0.71
FVC	−0.01	0.04	0.61	0.00	0.04	0.65
Comorbidity	0.10	0.18	0.008	0.05	0.08	0.19
R² change		10.6%	< 0.001		12.1%	< 0.001
Explained variance		16.1			15.0
Fatigue at baseline
Fatigue				0.18	0.17	0.03
R² change					16.2%	< 0.001
Explained variance					31.2%
Other symptoms at baseline
Shortness of breath	0.33	0.13	0.06	1.27	0.46	< 0.001
Cough	0.64	0.25	< 0.001	0.50	0.18	0.004
Depression	0.05	0.23	0.003	0.01	0.04	0.63
Anxiety	−0.05	−0.07	0.29	0.00	0.00	0.95
Sleep disturbance	0.02	0.20	0.01	0.01	0.11	0.12
Pain	0.44	0.20	0.01	−0.29	−0.07	0.26
R² change		30.5%	< 0.001		23.2%	< 0.001
Explained variance		46.6%			54.3%

Bold numbers represent significant relationships.
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.