Table 4 Difference-in-differences of lung function.

From: Development of a behavior change intervention to improve physical activity in patients with COPD using the behavior change wheel: a non-randomized trial

Variables

Experimental group (n = 45)

Control group (n = 44)

DID between groups (95% CI)

P value

Baseline

12 weeks

Within-group effect (P)

Baseline

12 weeks

Within-group effect (P)

FEV1%

57.18 ± 15.87

60.58 ± 15.31

0.01

57.84 ± 16.62

56.77 ± 14.30

0.12

− 4.45 (− 6.62 to − 2.28)

 < 0.001

FEV1

1.61 ± 0.35

1.69 ± 0.34

0.23

1.58 ± 0.60

1.59 ± 0.34

0.96

− 0.11 (− 0.34 to 0.13)

0.37

FVC

2.78 ± 0.56

2.76 ± 0.58

0.37

2.67 ± 0.92

2.76 ± 0.55

0.61

− 0.07 (− 0.46 to 0.33)

0.74

FEV1/FVC

58.03 ± 6.94

59.12 ± 6.75

0.13

58.98 ± 6.71

57.88 ± 6.94

0.43

− 2.40 (− 6.14 to 1.33)

0.21

  1. Significant values are in [bold].
  2. FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; DID, difference-in-difference.
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