Table 3. Comparison of prediction based on observed to predicted serum MMP-9 ratios to presence or absence of screenworthy pathology.

	Observed/predicted ratio
	+ve (>1.0)	−ve (⩽1.0)
SWP
Yes	91	4	95
No	113	92	205
	204	96	300

Abbreviation: SWP=screenworthy pathology.

Sensitivity: 44.6%, specificity: 95.8%, positive predictive value: 95.8%, negative predictive value: 44.9%.