Table 1. Univariate analysis with cerebral blood flow as the outcome and the candidate predictor variables as covariates.

Candidate predictor	β1 Estimate	P
CMRO2	0.20	0.0025
CMRglc	0.75	0.12
Age	−0.11	0.42
Male	−3.24	0.38
pAO2	−0.06	0.66
Hct	0.41	0.50
CAHgb	0.12	0.91
CAO2	−1.25	0.24
pACO2	0.20	0.69
CAglc	−0.33	0.28
OEF	−15.58	0.57

C_Aglc, arterial glucose concentration (mg/100 mL); C_AHgb, arterial hemoglobin concentration (g/100 mL); C_AO₂, arterial oxygen content (mL O₂/100 mL blood); CMRglc, cerebral metabolic rate of glucose (micromol/100 g per minute); CMRO₂, cerebral metabolic rate of oxygen (micromol/100 g per minute); Hct, hematocrit; male, binary variable with 1 for males and 0 for females; OEF, oxygen extraction fraction; p_ACO₂, arterial partial pressure of carbon dioxide (mm Hg); p_AO₂, arterial partial pressure of oxygen (mm Hg).

The second column gives parameter estimates for β₁ for each predictor, and the final column shows the P values associated with the tests of H₀: β₁=0 versus H_a: β₁ 0.