Table 7.

Area under the receiver operator characteristic (ROC) curves and their 95% confidence intervals (CIs) for the ability of the absolute change in left atrium to aortic ratio (LA:Ao) and percentage change in LA:Ao between the first and second re-examinations to discriminate cats that go on to experience an event from those that do not

Variable	AUC for ROC curve	95% CIs for AUC	P value	Proposed cut-off value	Sensitivity of proposed cut-off (95% CI)	Specificity of proposed cut-off (95% CI)
LA:Ao absolute change	0.902	0.751–1.0	<0.001	0.12	0.889 (0.565–0.98)	0.905 (0.711–0.973)
LA:Ao percentage change	0.836	0.665–1.0	<0.001	8.04%	0.778 (0.453–0.937)	0.81 (0.6–0.923)

AUC = area under the curve