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Table 1 Characteristics of the included studies assessing 30-day readmissions after CABG

From: Patient and hospital factors associated with 30-day readmissions after coronary artery bypass graft (CABG) surgery: a systematic review and meta-analysis

Author’s last name (Year), Country

Data source (Study period)

Study sample

% Male

Mean age at procedure

% Diabetes

% Hypertension

% Elective procedure

% Isolated procedure

Alkhouli (2019) [20], USA

National Readmissions Database (2015–2016)

411,159

75%

66 years

51%

84%

50%

 

Anderson (2016) [21], USA

California Coronary Artery Bypass Grafting Outcomes Reporting Program (2011–2012)

21,638

      

Angraal (2018) [12], USA

Medicare fee-for-service inpatient claims data (1999–2004)

1,863,719

66%

74 years

31%

63%

  

Auerbach (2009) [22], USA

Clinical data from multiple centres in North Carolina (2003–2005)

81,289

72%

65 years

37%

72%

  

Barnett (2018) [23], USA

Clinical data from multiple centres (2008–2011)

5818

99%

60 years

49%

 

100%

 

Benuzillo (2018) [24], USA

Clinical data from multiple centres (2010–2014)

2589

80%

67 years

42%

83%

43%

 

Bianco (2019) [25], USA

Pennsylvania Health Care Cost Containment Council databases (2014–2016)

16,641

      

Bianco (2019) [26], USA

Clinical data from a single centre (2011–2017)

7048

75%

65 years

46%

90%

42%

100%

Blackledge (2009) [27], UK

Hospital inpatient data (1995–2004)

2520

79%

 

21%

 

82%

 

Brooke (2015) [7], USA

Medicare and Medicaid beneficiary data (2001–2011)

1,502,815

      

Case (2019) [28], USA

Clinical data from a single centre (2011–2017)

150

75%

63 years

49%

 

63%

 

Chan (2020) [29], USA

Clinical data from a single centre (2011–2017)

4980

75%

66 years

47%

90%

34%

100%

Chen (2015) [30], USA

Patient discharge database (2011)

5813

77%

67 years

    

Cho (2019) [31], USA

Clinical data from a single centre (2013–2016)

1552

75%

65 years

29%

80%

 

100%

Connolly (2018) [32], USA

Florida, California, New York, Maryland, and Kentucky State Inpatient Databases (2007–2014)

312,018

74%

66 years

30%

58%

  

Deo (2019) [33], USA

National readmission database (2014)

135,699

75%

66 years

46%

  

100%

Fanari (2017) [34], USA

Clinical data from multiple centres (2010–2013)

1277

74%

67 years

44%

 

49%

 

Feng (2018) [35], USA

California, Florida, and New York State Inpatient Databases (2007–2011)

177,229

74%

66 years

41%

80%

 

100%

Fox (2013) [36], USA

California State Inpatient and Emergency Department Databases (2005–2009)

63,911

75%

    

100%

Girotti (2014) [37], USA

National Medicare beneficiaries database (2006–2008)

232,980

68%

74 years

29%

65%

48%

100%

Gurram (2019) [38], India

Clinical data from a single centre (2015–2016)

773

83%

62 years

73%

71%

  

Hannan (2003) [39], USA

New York state inpatient database (1999)

16,325

72%

 

32%

  

100%

Hannan (2011) [40], USA

New York state inpatient database (2005–2007)

33,936

74%

 

36%

  

100%

Hirji (2020) [41], USA

National readmission database (2010–2015)

844,206

67%

     

Hwang (2007) [42], USA

5% sample of Medicare beneficiaries database (2001–2003)

22,091

65%

All patients aged 65+ years

27%

60%

48%

 

Iribarne (2014) [43], USA

Clinical data from multiple centres in the United States and Canada (2010)

5059

67%

64 years

23%

 

76%

33%

Khuory (2019) [8], USA

Nationwide readmission database (2010–2014)

855,836

75%

65 years

47%

80%

 

100%

Kim (2015) [44], USA

Administrative claims database (2010–2012)

41,031

      

Koochmeshki (2013) [45], Iran

Clinical data from a single centre (2004–2011)

952

70%

59 years

23%

40%

 

100%

Lancey (2014) [46], USA

Society of Thoracic Surgeons (STS) compliant registry (2007–2011)

4861

73%

65 years

40%

84%

 

100%

Li (2012) [48], USA

California CABG outcomes reporting program (2009)

11,823

75%

57% aged > 65 years

45%

87%

40%

100%

Li (2014) [47], USA

California CABG outcomes reporting program (2010–2011)

22,389

76%

22% aged > 75 years

46%

87%

41%

100%

Li (2015) [49], USA

California CABG outcomes reporting program (2012)

14,051

75%

67 years

52%

88%

40%

83%

McNeely (2017) [13], USA

Medicare and Medicaid Services data (2000–2012)

1,116,991

68%

74 years

30%

60%

32%

100%

Narain (2019) [50], UK

Clinical data from a single centre (2012–2017)

649

83%

67 years

31%

80%

50%

100%

O’Brien (2018) [51], Australia

Australian and New Zealand Society of Cardiac and Thoracic Surgeons registry (2000–2012)

36,902

79%

65 years

35%

80%

 

100%

Price (2013) [52], USA

New York Cardiac Surgery Reporting System (CSRS) (2006–2011)

1205

77%

65 years

31%

   

Reis (2008) [53], Brazil

Clinical data from a single centre (2006–2007)

290

  

29%

79%

  

Rosenblum (2019) [54], USA

Clinical data from a single centre (2002–2017)

21,719

 

63 years

41%

86%

64%

100%

Saab (2013) [55], Lebanon

Clinical data from a single centre (2010)

110

86%

50% aged > 65 years

43%

76%

  

Saito (2019) [56], Japan

Japan Cardiovascular Surgery Database (2015–2016)

29,395

79%

 

54%

77%

 

100%

Sargin (2016) [57], Turkey

Clinical data from a single centre (2013)

1103

55%

65 years

26%

69%

  

Sedrakyan (2016) [14], USA

Register data from New York and California states (2005–2011)

198,461

72%

29% aged > 75 year

42%

63%

  

Shah (2019) [58], USA

National readmission database (2013–2014)

288,059

75%

65 years

32%

73%

46%

100%

Shahian (2014) [59], USA

Society of Thoracic Surgeons National Database (2008–2010)

162,572

69%

69% aged > 70 year

40%

87%

 

100%

Shehata (2013) [60], Canada

Clinical data from a single centre (2007–2009)

2102

77%

66 years

 

65%

  

Slamowicz (2008) [61], Australia

Victorian Admitted Episodes Dataset (1998–2003)

6627

78%

65 years

  

100%

 

Stewart (2000) [62], USA

Clinical data from a single centre (1997)

485

67%

65 years

37%

62%

 

100%

Tam (2018) [63], Canada

CorHealth Ontario Cardiac Registry (2008–2016)

63,336

76%

66 years

34%

71%

62%

 

Trooboff (2019) [64], USA

Clinical data from multiple centres (2008–2010)

1683

     

78%

Tsai (2013) [65], USA

National Medicare data (2009–2010)

153,496

      

Tseng (2018) [66], Taiwan

Health insurance database (2005)

1575

93%

65 years

    

Zywot (2018) [11], USA

Hospital Readmission reduction database from California and New York (2006–2011)

126,519

71%

34% aged 75+ years

41%

77%

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