Table 2: Description of the variables and their correlation coefficient with reel age.

Variables

Correlation coefficient (Spearman)

P-value

I_St1

-0.135148

0.06231

I_St2

-0.2141245

0.002936

I_St3

-0.2470138

0.0005712

I_St4

0.2727233

0.0001351

C_St1

-0.6170941

< 2.2e-16

C_St2

-0.3976513

1.225e-08

C_St3

0.7395386

< 2.2e-16

C_St4

0.7395386

< 2.2e-16

PM_St1

-0.6801941

< 2.2e-16

PM_St2

-0.4880747

7.956e-13

PM_St3

-0.3425723

1.229e-06

PM_St4

0.7607081

< 2.2e-16

M_St1

-0.6856221

< 2.2e-16

M_St2

-0.2358707

0.00102

M_St3

-0.04920808

0.499

M_St4

0.7981866

< 2.2e-16