Table 5.

Multivariate analysis of correlations between ${\dot{\text{V}}\text{O}}_2$ at peak exercise and age, FEV₁, and PM_CSA as predictive variables.

	Multivariate analysis
	β	95% CI	p value
Age (years)	− 0.059	− 0.185–0.068	0.36
FEV1 (L)	0.826	− 1.01–2.662	0.37
PMCSA (cm2)	0.175	0.03–0.319	0.02

FEV₁ forced expiratory volume in 1 s, ECM_CSA cross-sectional area of erector spinae muscles, β standardized β value, CI confidence interval.