Table 2 Variables significantly predictive of in‐hospital death at univariate analysis.

	Odds ratio (95% CI)	p Value
Age >70	12.3 (1.5 to 10.12)	0.02
⩾10 extrasystoles/h	7.25 (1.69 to 30.9)	0.007
SDNNi <39 ms	4.99 (1.18 to 21.1)	0.029
LF <15.7 ms	4.94 (1.16 to 20.9)	0.030
LF:HF <1.12	5.14 (1.21 to 21.8)	0.026

Complex ventricular arrhythmias are excluded, as all patients who died had these forms of arrhythmias on Holter monitoring.

HF, high frequency; LF, low frequency; NSVT, non‐sustained ventricular tachycardia; SDNNi, mean of the standard deviations of RR intervals of all 5 min segments in 24 h.