Table 2
GRADE assessment of included studies
ID Study Limitations of design (Risk of bias) Inconsistency or heterogenity Indirectness (PICO and Applicablity) Imprecision of result Publication bias Quality rating
A [30] (Aghlmand et al., 2008) √ √ √ √ √ Moderate
B [24] (Kalisch et al., 2007) √ √ √ X √ Low
C [27] (Curtis et al., 2008) √ √ √ √ √ Moderate
D [26] (Kipp et al., 2001) √ X X X √ Very Low
E [25] (Oosthuizen et al., 2002) √ √ √ X √ Low
F [29] (Brown et al., 2007) √ √ √ √ √ High
G [28] (Schmied et al., 2009) √ √ √ X √ Low
H [23] (Moffitt et al., 2009) √ √ √ X √ Low
I [22] (Wessels et al., 2010) √ √ √ X √ Low
J [37] (Varelas et al., 2004) √ √ √ √ √ Low
K [35] (Nolan et al., 2005) √ √ X √ √ Low
L [34] (Scott et al., 2000) √ √ X √ √ Moderate
M [39] (Van Zyl et al., 2004) √ X √ √ √ Low
N [36] (Feldman et al., 2006) √ X √ √ √ Very Low
O [33] (Mehta et al., 2002) √ √ √ √ √ Moderate
P [31] (Halm et al., 2004) √ √ √ √ √ Moderate
Q [32] (Meehan et al., 2001) √ √ √ √ √ Moderate
R [38] (Choma et al., 2009) √ √ √ √ √ Moderate
S [41] (Koplan et al., 2008) √ √ √ √ √ Moderate
T [40] (Smith et al., 2004) √ √ √ √ √ Moderate

Conry et al. BMC Health Services Research 2012 12:275   doi:10.1186/1472-6963-12-275

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