Table 2 Correlation matrix of the variables used in the regression model

PAL

Age (years)

-0.101

Gender (female = 1)

-0.012

-0.207

FEV₁ (percent predicted)

0.446**

0.075

0.093

Walking speed (m/s)

0.426**

0.046

-0.172

0.253*

Quadriceps strength (kg)

0.397**

-0.088

-0.410**

0.120

0.315**

FFMI (kg/m²)

0.286*

0.098

-0.591**

0.089

0.147

0.524**

CRP (log values)

-0.167

0.139

-0.058

-0.006

-0.038

0.063

0.106