Table 1. CBF, CMRO2, and OEF values.
Cortical region | CBF |
CMRO2 |
OEF |
||||||
---|---|---|---|---|---|---|---|---|---|
Mean at age 50 | α | P value of α | Mean at age 50 | α | P value of α | Mean at age 50 | α | P value of α | |
F-M1 | 49 | −0.18 | <0.001 | 170 | −0.31 | 0.031 | 0.41 | 0.001 | 0.014 |
P-S1 | 49 | −0.14 | 0.006 | 179 | −0.28 | 0.064 | 0.43 | 0.001 | 0.031 |
T | 45 | −0.12 | 0.007 | 166 | −0.24 | 0.065 | 0.44 | 0.001 | 0.031 |
O | 51 | −0.05 | 0.336 | 200 | −0.18 | 0.323 | 0.46 | 0.001 | 0.254 |
M1S1 | 46 | −0.10 | 0.018 | 171 | −0.19 | 0.192 | 0.43 | 0.001 | 0.063 |
CBF, cerebral blood flow; CMRO2, cerebral metabolic rate of oxygen consumption; F-M1, frontal lobe without primary motor area; M1S1, primary motor and somatosensory area; O, occipital lobe; OEF, oxygen extraction fraction; P-S1, parietal lobe without primary somatosensory area; T, temporal lobe.
Mean parametric values at age 50, CBF (mL/100 g per minute), CMRO2 (μmol/100 g per minute). α is the coefficient for the linear regression of CBF, CMRO2, and OEF with age as independent variable.