Table 2. Mean and s.d. of oxygen extraction fraction (OEF) across the cortex (%) in reproducibility analyses.

Intraobserver	Reading #1	Reading #2	T-test P value	Veins selected in common (%)
Controls (N=5)	32.8±4	32.5±3	0.71	61.2
Patients (N=5)	28.2±2	28.8±2	0.95	59.2
Interobserver	Observer #1	Observer #2	T-test P value	Veins selected in common (%)
Controls (N=5)	32.8±4	33.4±2	0.56	33.3
Patients (N=5)	28.2±2	30.1±3	0.15	15.0
Scan–rescan	Week #1	Week #2	T-test P value	Veins selected in common (%)
Controls (N=5)	29.3±3	30.2±1	0.50	34.1