From: A systematic review of the impact of volume of surgery and specialization in Norwood procedure
Study | Representativeness of study cohort | Ascertainment of intervention | Comparability of intervention and comparison/control group | Assessment of outcomes | Addressing incomplete data/quality of registry data | Missing data on primary interventions and outcomes/selection of patients |
---|---|---|---|---|---|---|
Register based studies | Â | Â | Â | Â | Â | Â |
Chang 2002 [34] | ? | ? | ? | + | ? | + |
Gutgesell 2002 [35] | ? | ? | ? | + | ? | + |
Checchia 2005 [42] | ? | + | ? | + | ? | - |
Berry 2006 [33] | + | + | + | + | ? | + |
Hirsch 2008 [36] | + | + | ? | + | ? | + |
Welke 2009 [23] | ? | + | ? | + | ? | ? |
McHugh 2010 [40] | ? | ? | ? | + | ? | + |
+ | ? | + | + | ? | ? | |
clinical studies | Â | Â | Â | Â | Â | Â |
Karamlou 2010 [39] | ? | + | ? | + | ? | ? |
Tabbutt 2012 [41] | ? | + | ? | ? | ? | ? |