Table 4.

Correlations between serum potassium levels and atrial fibrillation.

Serum potassium concentration	Postoperative day	Postoperative atrial fibrillation
		Yes	No	p-value
	Day 0	3.79 $\pm$ 0.47	3.79 $\pm$ 0.49	0.91
	Day 1	4 $\pm$ 0.34	4 $\pm$ 0.37	0.21
	Day 2	3.88 $\pm$ 0.38	3.88 $\pm$ 0.35	0.97
	Day 3	3.81 $\pm$ 0.35	3.85 $\pm$ 0.38	0.24
	Day 4	3.79 $\pm$ 0.44	3.81 $\pm$ 0.4	0.68
	Day 5	3.82 $\pm$ 0.43	3.91 $\pm$ 0.45	0.09

All data were expressed as mean and standard deviation.