Table 3. Comparison between index admission and readmission in HF and AF.

Variable		Index	Readmission	p value
HFpEF and AF
	Sample size	24,176	3,734 (16.51%)
	Died (%)	6.47	8.88	<0.001
	Mechanical ventilation (%)	20.1	16.44	<0.001
	Cardiogenic shock (%)	1.52	1.05	0.11
	Length of stay (days)	6.15	6.18	0.83
	Total charges ($)	55,690	57,971	0.2
HFrEF and AF
	Sample size	22,178	3,433 (16.7%)
	Died (%)	7.24	7.82	0.42
	Mechanical ventilation (%)	20.36	13.85	<0.001
	Cardiogenic shock (%)	8.27	5.49	<0.001
	Length of stay (days)	6.5	6.02	0.01
	Total charges ($)	75,035	65,971	0.01

HF = heart failure; AF = atrial fibrillation; HFpEF = heart failure preserved ejection fraction; HFrEF = heart failure with reduced ejection fraction.