Table 4.

Hazard Ratios for Association Between Variables and Postoperative Atrial Fibrillation

Timing Reduced HRV	RR	p-value (CI 95%)	RR	p-value (CI 95%)	RR	p-value (CI 95%)
	At 7 Days		At 3 Months		At 6 Months
SDNN ≤ 50 ms	3.502	>0.05 (0.708–17.322)	30.882	< 0.001 * (4.503–211.777)	5.404	<0.05 * (1.078–27.087)
rMSSD ≤ 15 ms	3.444	>0.05 (0.987–12.015)	0.906	> 0.05 (0.170–4.835)	1.138	> 0.05 (0.304–4.259)

Notes: *(The bold values): Statistically significant difference. Multivariate was used to find the predictor of postoperative AF.

Abbreviation: CI, confidence of interval.