Table 6.

Comparisons of Models of Conventional CMR Indices With and Without Novel T1 Indices in Predicting Long-Term MACE After STEMI

Model	Predictors	C-statistic	Integrated Brier Score	Comparison of Models		Net Reclassification Index		Integrated Discrimination Improvement Index
				Chi-Square Difference	P Value	Index	P Value	Index	P Value
A	Acute LVEF MVO presence Infarct size	0.67 ± 0.07	0.076	N/A
B	Acute LVEF MVO presence Infarct size Infarct T1 Noninfarct T1	0.76 ± 0.06	0.064	Model A vs B
				15.52	<0.001	39.8% (95% CI: 12.2%-64.4%)	0.007	16.4% (95% CI: 6.8%-30.9%)	<0.001
C	Acute LVEF <40% MVO presence Infarct size	0.69 ± 0.06	0.075	N/A
D	Acute LVEF <40% MVO presence Infarct size Infarct T1 Noninfarct T1	0.77 ± 0.06	0.064	Model A vs D
				17.32	<0.001	50.4% (CI 17.7%-68.3%)	0.013	18.7% (CI 6.5%-32.4%)	<0.001
				Model C vs D
				13.21	0.001	42.3% (CI 1.4%-66.2%)	0.027	16.1% (CI 4.7%-30.1%)	<0.001

Comparison of the ability of models with conventional CMR indices (A, C) and models with T1 indices added (B, D) to predict clinical outcomes.

C-statistic = concordance statistic; MACE = major adverse cardiac events; N/A = not applicable; other abbreviations as in Tables 1 and 2.