Supplemental Table 7. Correlation between each ECG parameter.

	Heart rate		PR interval		QRS duration		QTc interval
	r	P-value	r	P-value	r	P-value	r	P-value
PR interval	-0.128	＜0.001
QRS duration	-0.081	0.006	0.171	＜0.001
QTc interval	0.161	＜0.001	0.164	＜0.001	0.396	＜0.001
sV1+rV5	-0.18	0.541	0.071	0.017	0.022	0.462	0.122	＜0.001

Spearman’s rank correlation coefficient was calculated. A 2-tailed P, 0.05 was considered statistically significant.