Table 6.

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

	Multivariate analysis
	β	95% CI	p value
Age (years)	− 0.058	− 0.187–0.072	0.37
FEV1 (L)	0.785	− 1.099–2.668	0.41
ECMCSA (cm2)	0.192	− 0.001–0.385	0.052

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