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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%