Value of the fT3/fT4 ratio and its combination with the GRACE risk score in predicting the prognosis in euthyroid patients with acute myocardial infarction undergoing percutaneous coronary intervention: a prospective cohort study

Table 4 Comparisons of the predictive performance of fT3, fT4, fT3/fT4 ratio and GRACE for the prognosis prediction

	z for C-statistic	p for C-statistic	NRI	p for NRI	IDI	p for IDI
fT3 vs. fT3/fT4 ratio	2.062	0.039	0.625	<0.001	0.056	0.001
fT4 vs. fT3/fT4 ratio	2.438	0.015	0.656	<0.001	0.053	0.002
GRACE vs. fT3/fT4 ratio	0.261	0.794	-0.049	0.766	-0.017	0.452
fT3 vs. GRACE	2.013	0.044	0.594	<0.001	0.039	0.005
fT4 vs. GRACE	2.202	0.028	0.531	0.001	0.036	0.011
fT3 vs. fT4	0.117	0.907	−0.075	0.649	−0.002	0.677

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