Table 2.

Spearman’s rank correlation coefficients ($r$) among the three ranking orders. Each row of the table shows the correlation coefficients for one imaging modality. Each column of the table shows the correlation coefficients between the two FOMs being compared, as indicated in the header row of the same column. The $p$-value for testing against a null hypothesis of zero correlation is also reported.

	AUC and CC	AUC and NSS	CC and NSS
PET	$r=0.87$ ($p<0.001$)	$r=0.87$ ($p<0.001$)	$r=0.93$ ($p<0.001$)
CT	$r=0.66$ ($p=0.007$)	$r=0.65$ ($p=0.008$)	$r=0.96$ ($p<0.001$)
CXR	$r=0.77$ ($p<0.001$)	$r=0.81$ ($p<0.001$)	$r=0.99$ ($p<0.001$)