Table 3.

ROC analysis and AUC: overall and according to heart failure (HF) status

	AUC	95% CI	Youden index	Sensitivity	Specificity
Baseline troponin I value
Overall	0.63	0.58 to 0.68	19.5	0.92	0.41
Group 1 (no HF)	0.67	0.56 to 0.76	18.5	0.88	0.54
Group 2 (mild HF)	0.71	0.63 to 0.79	22.5	0.90	0.53
Group 3 (severe HF)	0.54	0.37 to 0.58	19.5	0.92	0.25
Change in troponin I absolute values
Overall	0.83	0.79 to 0.88	29.4	0.87	0.78
Group 1 (no HF)	0.81	0.72 to 0.89	87.4	0.72	0.78
Group 2 (mild HF)	0.86	0.79 to 0.93	49.4	0.88	0.76
Group 3 (severe HF)	0.82	0.75 to 0.89	30.9	0.81	0.75
Change in troponin I relative values (%)
Overall	0.83	0.78 to 0.88	42.5	0.88	0.69
Group 1 (no HF)	0.79	0.69 to 0.88	75.2	0.79	0.70
Group 2 (mild HF)	0.79	0.70 to 0.88	43.0	0.94	0.61
Group 3 (severe HF)	0.89	0.83 to 0.95	21.1	1.00	0.75

Group 1 comprises patients without HF, group 2 patients with mild HF, group 3 patients with more severe HF.

AUC, area under the curve; ROC, receiver operating characteristic.