Table 1.

Univariate analysis of categorical variables.

Variables	Total (N = 1,727)	No readmission within 6 months (N = 1,065)	Readmission within 6 months (N = 662)	p-value	No readmission within 3 months (N = 1,309)	Readmission within 3 months (N = 418)	p-value
Age (years)				0.117			0.103
≤59	154 (8.92%)	104 (9.77%)	50 (7.55%)		125 (9.55%)	29 (6.94%)
>59	1,573 (91.08%)	961 (90.23%)	612 (92.45%)		1,184 (90.45%)	389 (93.06%)
Gender				0.413			0.868
Male	717 (41.52%)	434 (40.75%)	283 (42.75%)		542 (41.41%)	175 (41.87%)
Female	1,010 (58.48%)	631 (59.25%)	379 (57.25%)		767 (58.59%)	243 (58.13%)
NYHA class				<0.001			<0.001
II	297 (17.20%)	208 (19.53%)	89 (13.44%)		247 (18.87%)	50 (11.96%)
III	910 (52.69%)	569 (53.43%)	341 (51.51%)		698 (53.32%)	212 (50.72%)
IV	520 (30.11%)	288 (27.04%)	232 (35.05%)		364 (27.81%)	156 (37.32%)
Myocardial infarction				0.750			0.874
No	1,600 (92.65%)	985 (92.49%)	615 (92.90%)		1,212 (92.59%)	388 (92.82%)
Yes	127 (7.35%)	80 (7.51%)	47 (7.10%)		97 (7.41%)	30 (7.18%)
Congestive heart failure				0.812			0.230
No	122 (7.06%)	74 (6.95%)	48 (7.25%)		87 (6.65%)	35 (8.37%)
Yes	1,605 (92.94%)	991 (93.05%)	614 (92.75%)		1,222 (93.35%)	383 (91.63%)
Peripheral vascular disease				0.490			0.280
No	1,641 (95.02%)	1,015 (95.31%)	626 (94.56%)		1,248 (95.34%)	393 (94.02%)
Yes	86 (4.98%)	50 (4.69%)	36 (5.44%)		61 (4.66%)	25 (5.98%)
COPD				0.624			0.122
No	1,524 (88.25%)	943 (88.54%)	581 (87.76%)		1,164 (88.92%)	360 (86.12%)
Yes	203 (11.75%)	122 (11.46%)	81 (12.24%)		145 (11.08%)	58 (13.88%)
CCI score				<0.001			<0.001
0	1,322 (76.55%)	847 (79.53%)	475 (71.75%)		1,029 (78.61%)	293 (70.10%)
1	405 (23.45%)	218 (20.47%)	187 (28.25%)		280 (21.39%)	125 (29.90%)
Diabetes				<0.001			0.005
No	1,326 (76.78%)	848 (79.62%)	478 (72.21%)		1,026 (78.38%)	300 (71.77%)
Yes	401 (23.22%)	217 (20.38%)	184 (27.79%)		283 (21.62%)	118 (28.23%)

COPD, Chronic obstructive pulmonary disease; CCI, Charlson comorbidity index, 0: ≤2 points; 1: >2 points.