Cardiorespiratory coupling is associated with exercise capacity in patients with chronic obstructive pulmonary disease

Table 4 Multivariable regression model for distance as assessed by 6MWT

variable	Beta	SE	t value	p-value
Age, year	− 3.1	1.2	− 2.6	0.01
Synchrogram Index	93.3	42.2	2.2	0.03
CAT score	− 1.4	1.7	− 0.8	0.41
mMRC	− 37.9	12.9	− 2.9	0.005
Presence of emphysema	− 38.6	21.2	− 1.8	0.08

Presence of emphysema was defined as presence of emphysema in the high-resolution computed tomography
r² = 0.56, adjusted r² = 0.51, Residual stand error = 60.9, p < 0.0001
SE stand error of beta
The fitted model is Distance = 671.3 + 93.3(Synchrogram Index) − 3.1Age − 37.9mMRC

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