Table 3.

Survival prognosis in centenarians (N = 14).

	LF	LFn	LFn_ext	HF	HFext	RMSSD	pNN50	SDSD	SDNN	LF/HF	LF/HFext	MHR
ρ	0.423	0.172	0.295	0.190	0.232	0.304	0.247	0.304	0.536	0.214	0.251	−0.082
p	0.131	0.557	0.305	0.516	0.426	0.290	0.395	0.290	0.048*	0.463	0.386	0.782

^*p < 0.05.

LF, low frequency; LFn, normalized LF; LFn_ext, extended LFn; HF, high frequency; HFext, extended HF; RMSSD, root mean square of successive differences; pNN50, percentage of RR intervals which exceed 50 ms from the previous one; SDSD, SD of successive differences; SDNN, SD of the RR series; LF/HF, ratio between LF and HF; LF/HFext, ratio between LF and HFext; MHR, mean heart rate; ρ, Spearman’s correlation coefficient with “time to death”; p, p-value for Pearson’s correlation coefficient.