Table 4:

P values of comparisons for the sum of scores for the MR imaging features and ASL parameters among the 3 pathologic grades

WHO Grade	Sum of Scores	nCBF-sTI	nCBF-mTI	nBAT
II vs III	.139	.098	.021^{^a}	.005^{^a}
II vs IV	.015^{^a}	.006^{^a}	<.001^{^a}	.078
III vs IV	1	.905	.023^{^a}	1
LGGs vs HGGs	.006^{^a}	.003^{^a}	<.001^{^a}	.002^{^a}

↵a Significant at 95% (for intergroup comparisons among the WHO II, III, and IV grades. P values have been multiplied by 3 for Bonferroni correction).