Table 5 Change in the COPD assessment test results from baseline to 2 weeks, 6 months, and 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)