Table 5.

Change in the COPD assessment test results from baseline to 2 weeks, 6 months, and 1 year after surgery

		Before surgery	2 weeks after surgery	6 months after surgery	1 year after surgery
Cough frequency
Adjusted mean (SE)		0.82 (0.05)	2.00 (0.05)	0.96 (0.06)	0.68 (0.06)
Change from baseline (95% CI)a		Reference	1.18 (1.05, 1.31)	0.15 (0.01, 0.28)	− 0.14 (− 0.27, 0.00)
Amount of phlegm
Adjusted mean (SE)		0.83 (0.05)	0.89 (0.05)	0.77 (0.05)	0.67 (0.05)
Change from baseline (95% CI)a		Reference	0.05 (− 0.06, 0.16)	− 0.06 (− 0.18, 0.05)	− 0.16 (− 0.27, − 0.04)
Chest tightness
Adjusted mean (SE)		0.50 (0.05)	1.30 (0.05)	0.50 (0.05)	0.47 (0.05)
Change from baseline (95% CI)a		Reference	0.8 (0.68, 0.91)	− 0.01 (− 0.12, 0.11)	− 0.04 (− 0.15, 0.08)
Breathlessness walking upstairs
Adjusted mean (SE)		1.28 (0.06)	2.85 (0.06)	1.97 (0.06)	1.79 (0.07)
Change from baseline (95% CI)a		Reference	1.57 (1.43, 1.71)	0.70 (0.55, 0.84)	0.52 (0.37, 0.66)
Home activities limited
Adjusted mean (SE)		0.05 (0.03)	0.64 (0.03)	0.16 (0.04)	0.10 (0.04)
Change from baseline (95% CI)a		Reference	0.59 (0.51, 0.68)	0.12 (0.03, 0.21)	0.06 (− 0.04, 0.15)
Not confident leaving home
Adjusted mean (SE)		0.08 (0.04)	1.26 (0.04)	0.23 (0.05)	0.15 (0.05)
Change from baseline (95% CI)a		Reference	1.19 (1.07, 1.3)	0.16 (0.04, 0.28)	0.08 (− 0.04, 0.2)
Sleep disturbance
Adjusted mean (SE)		0.96 (0.06)	1.56 (0.07)	0.86 (0.07)	0.86 (0.07)
Change from baseline (95% CI)a		Reference	0.60 (0.44, 0.75)	− 0.10 (− 0.26, 0.06)	− 0.42 (− 0.58, − 0.25)
Lack of energy
Adjusted mean (SE)		1.49 (0.06)	2.50 (0.06)	1.84 (0.06)	1.80 (0.06)
Change from baseline (95% CI)a		Reference	1.00 (0.87, 1.14)	0.35 (0.21, 0.49)	0.31 (0.17, 0.46)

COPD chronic obstructive pulmonary disease, CI confidence interval, SE standard error

^aAdjusted for age, sex, stage, obesity, smoking status, cell type, type of surgery, video-assisted thoracic surgery, postoperative pulmonary complications, and adjuvant treatment