Table 3 Correlations between variables in the whole population and grade subgroups

Whole population

CBV

–

–

0.944

< 0.001*

0.849

< 0.001*

CBF

0.944

< 0.001*

–

–

0.870

< 0.001*

Ktrans

0.849

< 0.001*

0.870

< 0.001*

–

–

Ve

0.930

< 0.001*

0.937

< 0.001*

0.867

< 0.001*

1–2

CBV

–

–

0.786

< 0.001*

0.401

0.123

CBF

0.786

< 0.001*

–

–

0.397

0.128

Ktrans

0.401

0.123

0.397

0.128

–

–

Ve

0.665

0.005*

0.671

0.004*

0.397

0.128

3

CBV

–

–

0.792

0.001*

0.357

0.210

CBF

0.792

0.001*

–

–

0.597

0.024*

Ktrans

0.357

0.210

0.597

0.024*

–

–

Ve

0.506

0.065

0.651

0.012*

0.757

0.002*

4

CBV

–

–

0.722

0.043*

0.167

0.693

CBF

0.722

0.043*

–

–

0.143

0.736

Ktrans

0.167

0.693

0.143

0.736

–

–

Ve

0.690

0.058

0.762

0.028*

0.262

0.531