Table 1 Study quality
From: A systematic review of the impact of center volume in dialysis
Study | Representativeness | Ascertainment | Comparability | Outcome | Registry quality/addressing incomplete data | Selection/missing data on primary interventions and outcomes | ||
|---|---|---|---|---|---|---|---|---|
Mortality/survival | Switch to HD/other treatment | Peritonitis | ||||||
Afolalu 2009 [25] | – | + | – | + | ? | NA | ? | – |
Castrale 2010 [26] | – | ? | + | + | ? | ? | + | + |
Eisenstein 2008 [27] | + | + | + | + | NA | NA | – | + |
Evans 2013 [28] | + | + | + | + | + | NA | + | + |
Fenton 1997 [29] | + | + | + | + | NA | NA | ? | ? |
Fenton 1993 [30] | – | ? | ? | + | NA | NA | ? | – |
Guo 2003 [24] | + | ? | + | NA | ? | NA | ? | – |
Huisman 2002 [22] | + | ? | ? | + | ? | NA | + | + |
Lobbedez 2011 [31] | – | + | + | NA | ? | ? | + | ? |
Lobbedez 2013 [32] | + | + | + | + | ? | NA | + | – |
Martin 2011 [33] | + | + | + | NA | NA | ? | ? | + |
Mircescu 2014 [37] | + | ? | + | + | NA | NA | ? | ? |
Mujais 2006 [34] | ? | ? | ? | NA | ? | NA | ? | ? |
Nolph 1986 [35] | – | ? | ? | NA | NA | ? | + | ? |
Plantinga 2009 [36] | + | + | ? | + | ? | NA | ? | ? |
Schaubel 2001 [23] | + | ? | + | + | ? | NA | ? | ? |