Table 1 Patient characteristics according to readmission status.

From: Effect of Comorbidity On Unplanned Readmissions After Percutaneous Coronary Intervention (From The Nationwide Readmission Database)

Variable

CCI = 0 (n = 842,272)

CCI = 1 (n = 701,476)

CCI = 2 (n = 347,537)

CCI ≥ 3 (n = 403,061)

Not readmitted

Readmitted

p-value

Not readmitted

Readmitted

p-value

Not readmitted

Readmitted

p-value

Not readmitted

Readmitted

p-value

Age

62 ± 13

65 ± 14

<0.001

64 ± 12

66 ± 13

<0.001

67 ± 12

68 ± 13

<0.001

66.8 ± 12

68 ± 13

<0.001

Female

27.1%

36.1%

<0.001

33.3%

41.4%

<0.001

35.6%

42.0%

<0.001

36.3%

40.5%

<0.001

Year

  

<0.001

  

<0.001

  

0.010

  

0.15

  2010

22.6%

24.5%

 

22.3%

22.9%

 

21.6%

21.6%

 

19.7%

19.7%

 

  2011

20.7%

21.9%

 

20.6%

21.3%

 

20.1%

21.1%

 

19.5%

20.1%

 

  2012

19.1%

18.8%

 

19.1%

19.5%

 

19.0%

19.0%

 

19.1%

18.9%

 

  2013

19.6%

18.8%

 

19.7%

19.3%

 

20.2%

19.3%

 

20.9%

20.7%

 

  2014

18.0%

16.0%

 

18.2%

17.0%

 

19.1%

19.0%

 

20.8%

20.5%

 

Elective admission

16.0%

11.5%

<0.001

18.0%

11.8%

<0.001

18.0%

11.5%

<0.001

16.2%

10.6%

<0.001

Weekend admission

21.3%

22.0%

0.007

19.6%

21.3%

<0.001

19.7%

21.5%

<0.001

20.1%

21.7%

<0.001

Diagnosis of AMI

60.1%

58.4%

<0.001

48.8%

50.3%

<0.001

43.7%

45.9%

<0.001

43.4%

47.1%

<0.001

Primary expected payer

  

<0.001

  

<0.001

  

<0.001

  

<0.001

  Medicare

40.2%

50.5%

 

49.7%

57.6%

 

61.9%

68.6%

 

73.0%

77.2%

 

  Medicaid

6.1%

8.4%

 

8.3%

10.5%

 

8.2%

9.7%

 

7.1%

8.1%

 

  Private

40.7%

29.5%

 

31.2%

22.1%

 

22.1%

15.4%

 

15.2%

10.9%

 

  Uninsured

7.7%

6.4%

 

6.1%

5.3%

 

3.9%

3.1%

 

2.0%

1.6%

 

  No charge

1.0%

1.1%

 

0.9%

0.9%

 

0.6%

0.4%

 

0.3%

0.2%

 

  Other

4.2%

4.0%

 

3.9%

3.6%

 

3.3%

2.7%

 

2.5%

2.0%

 

Median household income (percentile)

  

<0.001

  

<0.001

  

0.001

  

0.013

0-25th

25.7%

27.0%

 

29.5%

31.4%

 

31.4%

32.4%

 

31.5%

32.4%

 

26-50th

24.7%

24.6%

 

25.6%

25.7%

 

25.8%

26.2%

 

25.3%

25.3%

 

51-75th

24.9%

24.5%

 

23.9%

23.4%

 

23.0%

22.7%

 

23.1%

22.9%

 

76-100th

24.7%

23.9%

 

21.0%

19.5%

 

19.9%

18.7%

 

20.1%

19.4%

 

Smoking

41.2%

37.5%

<0.001

41.9%

40.1%

<0.001

44.4%

42.4%

<0.001

39.2%

38.1%

0.001

Alcohol misuse

2.8%

3.1%

0.003

2.5%

2.7%

0.035

2.6%

3.0%

0.005

2.4%

2.5%

0.63

Dyslipidemia

66.8%

63.4%

<0.001

75.3%

70.6%

<0.001

75.2%

70.3%

<0.001

72.9%

69.0%

<0.001

Hypertension

64.1%

66.9%

<0.001

77.6%

77.5%

0.63

81.3%

81.1%

0.54

85.8%

86.0%

0.51

Bed size

  

<0.001

  

<0.001

  

0.007

  

0.046

Small

6.2%

5.4%

 

5.7%

5.1%

 

5.4%

4.9%

 

4.9%

4.6%

 

Medium

21.1%

20.6%

 

20.5%

21.0%

 

20.4%

19.9%

 

20.3%

20.7%

 

Large

72.7%

74.0%

 

73.8%

73.9%

 

74.2%

75.2%

 

74.8%

74.7%

 

Location

  

0.26

  

0.26

  

0.054

  

0.17

Rural

0.2%

0.1%

 

0.2%

0.2%

 

0.2%

0.2%

 

0.3%

0.2%

 

Urban

99.8%

99.9%

 

99.8%

99.8%

 

99.8%

99.8%

 

99.8%

99.8%

 

Teaching status

  

<0.001

  

0.002

  

<0.001

  

<0.001

Nonteaching

46.5%

47.7%

 

45.2%

46.3%

 

44.5%

46.2%

 

43.2%

44.9%

 

Teaching status

53.5%

52.3%

 

54.8%

53.7%

 

55.5%

53.8%

 

56.8%

55.1%

 

Multivessel disease

14.7%

15.1%

0.14

16.4%

15.8%

0.008

17.0%

16.5%

0.099

18.1%

17.7%

0.16

Bifurcation disease

2.8%

2.6%

0.074

2.8%

2.7%

0.38

3.0%

2.7%

0.048

3.1%

3.0%

0.19

Circulatory support

2.7%

4.9%

<0.001

2.7%

4.1%

<0.001

3.0%

3.7%

<0.001

3.7%

3.9%

0.29

Vasopressor use

0.4%

0.6%

<0.001

0.4%

0.5%

<0.001

0.5%

0.6%

0.071%

0.6%

0.7%

0.40

IABP use

2.6%

4.6%

<0.001

2.4%

3.7%

<0.001

2.6%

3.2%

<0.001

3.0%

3.2%

0.081

FFR use

1.7%

1.6%

0.61

1.9%

1.8%

0.34

2.1%

2.1%

0.78

2.2%

2.5%

0.005

IVUS use

6.9%

7.0%

0.52

7.0%

7.0%

0.90

7.2%

6.9%

0.20

7.2%

6.8%

0.016

DES

76.0%

69.6%

<0.001

75.6%

69.7%

<0.001

72.5%

67.4%

<0.001

69.7%

66.0%

<0.001

Complete heart block

0.9%

1.2%

<0.001

0.9%

1.0%

0.33

1.0%

1.2%

0.010

1.3%

1.2%

0.83

Stroke or TIA

1.3%

1.9%

<0.001

2.4%

2.7%

0.006

4.3%

4.3%

0.93

6.7%

6.0%

<0.001

Cardiogenic shock

2.3%

4.0%

<0.001

2.4%

1.7%

<0.001

2.9%

3.8%

<0.001

3.7%

3.9%

0.17

Cardiac arrest

1.9%

2.6%

<0.001

1.4%

1.7%

<0.001

1.6%

1.7%

0.26

2.1%

1.7%

<0.001

Acute kidney injury

0.3%

0.6%

<0.001

0.4%

0.8%

<0.001

0.6%

1.1%

<0.001

1.3%

1.4%

0.097

Bleeding

0.4%

0.7%

<0.001

0.5%

0.9%

<0.001

0.7%

1.1%

<0.001

1.3%

1.5%

0.041

Blood transfusion

0.04%

0.08%

0.002

0.05%

0.10%

<0.001

0.06%

0.07%

0.77

0.05%

0.08%

0.036

Vascular complication

0.6%

0.8%

<0.001

0.7%

1.0%

<0.001

1.0%

1.2%

0.001

1.2%

1.3%

0.035

Emergency CABG

1.2%

1.8%

<0.001

1.4%

1.8%

<0.001

1.6%

1.3%

0.011

1.3%

1.0%

<0.001

Discharge location

  

<0.001

  

<0.001

  

<0.001

  

<0.001

Home (self-care)

94.2%

87.3%

 

91.2%

83.2%

 

85.2%

76.0%

 

74.3%

66.2%

 

Short term hospital

0.4%

0.8%

 

0.4%

0.6%

 

0.4%

0.7%

 

0.7%

0.8%

 

Transfer to other institution

1.6%

4.0%

 

2.7%

5.4%

 

5.4%

8.3%

 

10.7%

13.3%

 

Care home

3.4%

7.2%

 

5.3%

9.9%

 

8.5%

14.3%

 

13.9%

18.9%

 

Discharge against medical advice or discontinue care

0.4%

0.8%

 

0.4%

0.8%

 

0.4%

0.8%

 

0.4%

0.8%

 

Length of stay

2.8 ± 3.5

3.5 ± 3.1

<0.001

3.2 ± 4.2

3.9 ± 3.3

<0.001

4.1 ± 5.8

4.6 ± 3.9

<0.001

6.3 ± 8.6

6.0 ± 6.7

<0.001

Cost of index PCI

$19,764 ± 14,066

$21,257 ± 13,460

<0.001

$20,558 ± 15,948

$21,933 ± 13,622

<0.001

$22,741 ± 19,409

$23,580 ± 14,7044

<0.001

$27,723 ± 26,288

$26,736 ± 16,559

<0.001

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