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Table 3 Study quality

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

      

Chang 2002 [34]

?

?

?

+

?

+

Gutgesell 2002 [35]

?

?

?

+

?

+

Checchia 2005 [42]

?

+

?

+

?

-

Berry 2006 [33]

+

+

+

+

?

+

Hirsch 2008 [36]

+

+

?

+

?

+

Welke 2009 [23]

?

+

?

+

?

?

McHugh 2010 [40]

?

?

?

+

?

+

Hornik/Pasquali 2012 [37, 38]

+

?

+

+

?

?

clinical studies

      

Karamlou 2010 [39]

?

+

?

+

?

?

Tabbutt 2012 [41]

?

+

?

?

?

?

  1. + Low risk of bias, - High risk of bias, ? Unclear risk of bias.