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Table 2 Systematic review of hospital factors associated with 30-day readmission 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 (Year) Comparison groups Findingsa
Annual CABG volume
 Alkhouli (2019) [20] Low (< 100) 1.77 (1.68–1.87)
Intermediate (100–250) 1.11 (1.07–1.14)
High volume (> 250) 1.00 (Reference)
 Auerbach (2009) [22] Lowest quartile 1.22 (1.06–1.41)
Q2 1.16 (1.01–1.33)
Q3 1.21 (1.05–1.39)
Highest quartile 1.00 (Reference)
 Barnett (2018) [23] Low volume (< 200 cases) 0.83 (0.64–1.09)
Standard volume (≥200 cases) 1.00 (Reference)
 Chen (2015) [30] Lowest quartile 1.08 (0.66–1.75)
Q2 1.14 (0.80–1.63)
Q3 1.07 (0.78–1.46)
Highest quartile 1.00 (Reference)
 Feng (2018) [35] Lowest quartile 1.00 (Reference)
Q2 0.94 (0.91–0.98)
Q3 0.94 (0.90–0.98)
Highest quartile 0.95 (0.92–0.99)
 Khuory (2019) [8] Lowest tertile 1.00 (Reference)
Middle tertile 0.93 (0.89–0.96)
Highest tertile 0.95 (0.91–0.99)
 Li (2012) [48] 100–299 1.10 (0.93–1.29)
≥300 0.99 (0.79–1.22)
< 100 1.00 (Reference)
 McNeely (2017) [13] < 50 1.17 (1.12–1.21)
500–100 1.06 (1.02–1.09)
101–200 1.02 (0.99–1.06)
> 200 1.00 (Reference)
 Tsai (2013) [65]   Adjusted 30-day readmission rates:
Lowest quartile 19.2%
Q2 17.4%
Q3 17.2%
Highest quartile 17.2%
No. of hospital bed
 Li (2012) [48] ≥300 1.04 (0.79–1.36)
150–299 1.02 (0.78–1.35)
< 150 1.00 (Reference)
 Shah (2019) [58] Small 0.95 (0.87–1.04)
Medium 1.00 (0.95–1.06)
Large 1.00 (Reference)
Surgeon CABG volume
 Auerbach (2009) [22] Lowest quartile 1.02 (0.94–1.11)
Q2 1.05 (0.96–1.15)
Q3 1.03 (0.95–1.12)
Highest quartile 1.00 (Reference)
 Hannan (2003) [39] < 100 cases vs > 100 cases 1.16 (1.03–1.31)
Hospital teaching status
 Chen (2015) [30] Yes, vs no 0.92 (0.63–1.34)
 Li (2012) [48] Yes, vs no 1.12 (0.90–1.35)
 Shah (2019) [58] No vs yes 1.02 (0.97–1.07)
Hospital quality
 Hannan (2003) [39] Hospital risk-adjusted mortality rate, highest tertile vs lowest tertile 1.14 (1.03–1.25)
 Hannan (2011) [40] Hospital risk-adjusted mortality rate, highest tertile vs lowest tertile 1.10 (0.91–1.33)
 Hwang (2007) [42] Hospital degree of cardiac specialization  
Most 0.96 (0.77–1.19)
Moderate 1.0 (0.88–1.13)
Least 1.00 (reference)
 Tsai (2013) [65] Hospital Quality Alliance surgical score 30-day readmission rate:
Lowest quartile 17.8%
Q2 17.4%
Q3 17.2%
Highest quartile 17.5%
  1. a Findings are presented as adjusted ORs (95% CI), unless otherwise indicated