Table 2. Univariate analysis of variance of baseline CBF changes in ventral RPFC explained by different covariates and CBF in left homologous ROI.

Stress	Anxiety	Frustration	Effort	Difficulty	Cortisol	Heart Rate	LPFC CBF	Model
0.363	0.028	0.011	0.058	0.073	0.453	0.032	0.171	0.753
P = 0.014					P = 0.004		P = 0.112	P = 0.003

Results are based on values of partial R squared in spss, and the model includes all covariates and an intercept. LPFC, left prefrontal cortex.