Table 4. Results from different analysis methods.

Analysis methods	Control side (mean ± SD)	Impaired side (mean ± SD)	P value (paired t-test)
ROI-based analysis
BOLD CVR of 1.5-second PLD group (%/mmHg)	0.152±0.054	−0.049±0.055	<0.0001
BOLD CVR of 2.5-second PLD group (%/mmHg)	0.152±0.053	−0.042±0.074	<0.0001
CBF of 1.5-second PLD group (mL/100 g/min)	44.13±11.58	37.62±11.37	<0.05
CBF of 2.5-second PLD group (mL/100 g/min)	39.68±12.49	40.50±14.82	0.73
Hemisphere-based analysis
BOLD CVR of 1.5-second PLD group (%/mmHg)	0.211±0.060	0.130±0.058	<0.0001
BOLD CVR of 2.5-second PLD group (%/mmHg)	0.269±0.066	0.179±0.068	<0.0001
CBF of 1.5-second PLD group (mL/100 g/min)	48.27±6.28	45.55±7.06	<0.05
CBF of 2.5-second PLD group (mL/100 g/min)	43.10±8.58	42.58±8.89	0.49

ROI, region of interest; BOLD, blood oxygen dependent; CVR, cerebrovascular reactivity; CBF, cerebral blood flow; PLD, post labeling delay; SD, standard deviation.