Table 2. The pre-operative electrocardiographic parameters of the patients.

	Postoperative AF group (n = 10)		Non-AF group (n = 26)		p-value
	Median	Min–max	Median	Min–max
Heart rate (beats/min)	76.5	64–127	85.5	53–109	0.349
P-wave amplitude (mV)	1.5	0.93–2.72	2.05	0.81–3.64	0.129
P-wave duration (ms)	124	99.6–129.2	112.4	57.6–134	0.069
P-wave dispersion (ms)	57.6	41.2–71.6	39.8	17.2–70	0.004
QTc dispersion (ms)	50	40–100	40	40–130	0.124
Increased P-wave dispersion (n)	10		9		< 0.001

AF: atrial fibrillation; Max: maximum; Min: minimum; QTc: corrected QT interval.