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Table 2: 
Spearman correlation (r) between CTP variables and age-related white matter change scale MRI score
CTP VariablesMRI Scorer (P value)
Blood Flow (n = 35)Periventricular WM−0.55(<.01)
Subcortical WM−0.50(<.01)
Average WM−0.55(<.01)
Average GM−0.43(<.01)
Blood volume (n = 35)Periventricular WM−0.23(.18)
Subcortical WM−0.050(.78)
Average WM−0.15(.39)
Average GM0.024(0.89)
MTT (n = 35)Periventricular WM0.45(<.01)
Subcortical WM0.43(<.01)
Average WM0.31(.07)
Average GM0.37(.03)
PS product (n = 16)Periventricular WM−0.20(.46)
Subcortical WM−0.22(.41)
Average WM−0.01(.9)
  • Note:—MRI indicates MR imaging; WM, white matter; GM, gray matter; PS, permeability surface product; MTT, mean transit time; CTP, CT perfusion.