Table 1 Characteristics of populations with and without 30-day readmission

Age (mean, SD)^b

54.6 (15.6)

54.7 (15.4)

54.5 (15.7)

0.004

Women n(%)^a

51,813 (41.5)

8166 (41.1)

43,647 (41.6)

0.125

Length of hospital stay (median, IQR)^b

11 (11)

13 (14)

11 (12)

< 0.001

Mechanical ventilation n(%)^a

584 (0.5)

41 (0.2)

543 (0.5)

< 0.001

ICU n(%)^a

4043 (3.2)

496 (2.5)

3547 (3.4)

< 0.001

Rescue n(%)^a

8088 (6.5)

1099 (5.5)

6989 (6.7)

< 0.001

Emergency n(%)^a

17,904 (14.4)

2917 (14.7)

14,987 (14.3)

0.180

MI n(%)^a

1123 (0.9)

130 (0.7)

993 (1.0)

< 0.001

Heart failure n(%)^a

23,645 (19.0)

3899 (19.6)

19,746 (18.8)

0.012

Peripheral Vascular Disease n(%)^a

1921 (1.5)

262 (1.3)

1659 (1.6)

0.006

Cerebrovascular disease n(%)^a

10,376 (8.3)

1582 (7.6)

8794 (8.4)

0.042

Dementia n(%)^a

149 (0.1)

27 (0.1)

122 (0.1)

0.540

Chronic Pulmonary Disease n(%)^a

3355 (2.7)

489 (2.5)

2866 (2.7)

0.029

Connective Tissue Disease n(%)^a

3547 (2.8)

617 (3.1)

2930 (2.8)

0.018

Peptic Ulcer Disease n(%)^a

1178 (0.9)

195 (1.0)

983 (0.9)

0.593

Diabetes Mellitus uncomplicated n(%)^a

20,963 (16.8)

3583 (18.0)

17,380 (16.6)

< 0.001

Mild Liver Disease n(%)^a

7318 (5.9)

1069 (5.4)

6249 (6.0)

0.001

Hemiplegia n(%)^a

153 (0.1)

23 (0.1)

130 (0.1)

0.842

Solid Tumor including leukemia, Lymphoma n(%)^a

2726 (2.2)

360 (1.8)

2366 (2.3)

< 0.001

Diabetes Mellitus complicated n(%)^a

20,724 (16.6)

3575 (18.0)

17,149 (16.4)

< 0.001

Moderate or Severe Liver Disease n(%)^a

1733 (1.4)

250 (1.3)

1483 (1.4)

0.087

Characteristic

Total n = 124,721

With 30-d Readmission, n = 19,893

Without 30-d Readmission, n = 104,828

P-value

Solid Tumor with metastatic n(%)^a

499 (0.4)

53 (0.3)

446 (0.4)

0.001

AIDS n(%)^a

28 (< 0.1)

5 (< 0.1)

23 (< 0.1)

0.986

CCI (mean, SD)^b

4.3 (2.0)

4.3 (2.0)

4.2 (2.0)

< 0.001

 Hemodialysis n(%)

91,901 (73.7)

12,760 (64.1)

79,141 (75.5)

< 0.001

 Peritoneal dialysis n(%)

25,333 (20.3)

5493 (27.6)

19,840 (18.9)

 Unknown dialysis n(%)

7487 (6.0)

1640 (8.2)

5847 (5.6)

 CCI = 2

30,413 (24.4)

4798 (24.1)

25,615 (24.4)

< 0.001

 3 < =CCI < =4

42,051 (33.7)

6526 (32.8)

35,525 (33.9)

 5 < =CCI < =6

34,895 (28.0)

5674 (28.5)

29,221 (27.9)

 CCI > 6

17,371 (13.9)

2904 (14.6)

14,467 (13.8)