Table 4.

Multiple linear regression analysis of factors associated with distance covered on the 6-minute walk test in all enrolled COPD patients (n=200)

Variable	Standardized coefficients – beta	Student’s t-test	P-value
Age	−0.348	−5.998	<0.0001
BMI	0.048	0.859	0.391
FEV1	0.349	5.615	<0.001
Baseline SpO2	0.132	2.209	0.028
Baseline HR	−0.096	−1.673	0.096
ABI	0.073	1.283	0.201

Abbreviations: COPD, chronic obstructive pulmonary disease; BMI, body mass index; FEV₁, forced expiratory volume in 1 second; SpO₂, pulse oximetry oxygen saturation; HR, heart rate; ABI, ankle-brachial index.