Table 1 Study characteristics
From: A systematic review of the impact of volume of surgery and specialization in Norwood procedure
Author (pub year) | Study type | Region/country | Data source | Period | Patient characteristics | Case definition (ICD-9-CM) |
|---|---|---|---|---|---|---|
Chang 2002 [34] (subgroup analysis) | Registry-based | US | NIS | 1988-1997 | Age ≤30 days at admission | 746.7 |
Gutgesell [35] 2002 | Registry-based | US | UHC | 1990-1999 | Age ≤30 days at admission | 746.7 + 39.61/34.42/37.4/38.34 to 38.85/39.56/39.0 |
Checchia 2005 [42] | Registry-based | US | PHIS | 1998-2001 | Age ≤30 days at admission | 746.7 + 39.0 |
Berry 2006 [33] | Registry-based | US | KID 1997 and 2000 | 1997 and 2000 | Teaching vs. non-teaching: | 746.5, 746.7, 747.10 + 39.0, 747.22 |
Age at admission in days, median (IQR): 1(0–6)/3(1–6) | ||||||
Male (%) 77/60 | ||||||
White (%) 64/62 | ||||||
Medicaid (%) 32/49 | ||||||
Noncardiac structural anomaly (%) 5/5 | ||||||
Prematurity/low birth weight (%) 7/5 | ||||||
Aortic atresia (%) 3/2 | ||||||
Chromosomal anomaly (%) 3/0 | ||||||
Hirsch 2008 [36] | Registry-based | US | KID 2003 | 2003 | Male 63.1% | 746.7 + 39.0 |
White 39.6% | ||||||
Non-white 33.5% | ||||||
Race unknown 26.9% | ||||||
Welke 2009 [23] (subgroup analysis) | Registry-based | US | STS-CHSDB | 2002-2006 | NR | NR |
Karamlou 2010 [39] | Clinical study | US + Canada | CHSS studies | 1994-2000 | NR | NR |
McHugh 2010 [40] | Registry-based | US | UHC | 1998-2007 | NR | 746.7 + 34.42/39.0/35.92/37.4/(38.34 to 38.85 + 39.61) |
Registry-based | US | STS-CHSDB | 2000-2009 | Mean age (days) 6 (IQR 4–9) |  | |
Mean weight (kg) 3.18 (IQR 2.80-3.50) | ||||||
Weight <2.5Â kg 9.7% | ||||||
Male 58.2% | ||||||
Noncardiac/genetic abnormality 19.9% | ||||||
Dominant ventricle: right 89.6%, left 8.0%, | ||||||
TAPVR 1.3% | ||||||
Mechanical ventilator support 39.9% | ||||||
Mechanical circulatory support 0.8% | ||||||
Shock 6.7% | ||||||
Arrhythmia 2.6% | ||||||
Neurologic deficit 1.3% | ||||||
Complete atrioventricular block 0.2% | ||||||
LOS >7Â days 20.8% | ||||||
Tabbutt 2012 [41] | Clinical study | US | Pediatric Heart Network SVR trial | 05/2005-07/2008 | NR | NR |