Table 5 AUC, NRI, and IDI models of linear parameters before and after adding non-linear parameters to differentiate post-STEMI patients (1 year) from controls.

	AUC	P value	NRI	P value	IDI	P value
SDNN	0.546
+slope 1–5	0.658	0.239	0.38	0.156	0.058	0.066
+area 1–5	0.713	0.087	0.815	<0.001	0.090	0.017
+area 6–20	0.734	0.045	0.679	0.008	0.136	0.004
+DFA α1	0.713	0.084	0.579	0.025	0.112	0.009
pNN20	0.519
+slope 1–5	0.642	0.279	0.592	0.023	0.059	0.071
+area 1–5	0.735	0.047	0.878	<0.001	0.102	0.011
+area 6–20	0.732	0.047	0.853	<0.001	0.143	0.003
+DFA α1	0.701	0.111	0.516	0.040	0.112	0.009
pNN50	0.586
+slope 1–5	0.657	0.468	0.380	0.156	0.058	0.069
+area 1–5	0.717	0.167	0.666	0.008	0.097	0.012
+area 6–20	0.735	0.113	0.853	<0.001	0.141	0.002
+DFA α1	0.701	0.231	0.516	0.047	0.108	0.011
LF	0.483
+slope 1–5	0.654	0.553	0.554	0.030	0.059	0.067
+area 1–5	0.705	0.229	0.666	0.008	0.093	0.015
+area 6–20	0.733	0.125	0.853	<0.001	0.141	0.002
+Alpha-1	0.701	0.212	0.516	0.047	0.111	0.009
HF	0.588
+slope 1–5	0.657	0.522	0.443	0.096	0.059	0.067
+area 1–5	0.697	0.290	0.815	<0.001	0.093	0.016
+area 6–20	0.732	0.146	0.729	0.003	0.140	0.003
+Alpha-1	0.706	0.227	0.617	0.017	0.114	0.009
LF/HF	0.652
+slope 1–5	0.669	0.799	0.318	0.239	0.034	0.152
+area 1–5	0.706	0.410	0.554	0.034	0.064	0.029
+area 6–20	0.728	0.254	0.492	0.062	0.109	0.005
+DFA α1	0.732	0.264	0.766	0.002	0.122	0.006

Abbreviations: STEMI = ST segment elevation myocardial infarction; SDNN = standard deviation of normal RR intervals; pNN20 = percentage of the absolute change in consecutive normal RR interval exceeds 20 ms; pNN50 = percentage of the absolute change in consecutive normal RR interval exceeds 50 ms; AUC = area under the curve; NRI = net reclassification improvement; IDI = integrated discrimination improvement; MSE = multiscale entropy; LF = low frequency; HF = high frequency.

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