Table 2

Risk of bias of included RCTs*

Study

Random sequence generation

Allocation concealment

Patient blinding

Assessor blinding

Reporting drop-out or withdrawal

Intention-to-treat analysis

Selective outcome reporting

Other potential bias


Clollinge (1998) [10]

Low

Low

High

Low

Low

High

High

Unclear

Dybwad (2007) [11]

Low

Low

High

Low

Low

Unclear

Low

Low

Surawy (2005) [12]

Unclear

Unclear

High

Unclear

High

Unclear

Unclear

Unclear

Walach (2008) [13]

Low

Low

Low

Low

Low

High

Low

Low

Field (1997) [14]

Low

Unclear

High

High

Unclear

Unclear

Unclear

High

Wang (2009) [15]

Unclear

Unclear

Low

Low

High

Unclear

Low

Unclear

Liu (2010) [16]

Unclear

Unclear

High

Unclear

Unclear

Unclear

Unclear

Unclear

Weatherley-Jones (2004) [17]

Low

Low

Low

Low

Low

Low

Low

Low

Awdry (1996) [18]

Unclear

Unclear

Low

Low

High

High

Low

Unclear

Hartz (2004) [19]

Low

Low

Low

Low

Low

Low

Low

Low

Forsyth (1999) [20]

Unclear

Unclear

Low

Unclear

Unclear

High

Unclear

Unclear

Santaella (2004) [21]

Unclear

Unclear

High

High

High

High

Low

Unclear

Brouwers (2002) [22]

Unclear

High

Low

Low

Low

Low

Unclear

Low

De Becker (2001) [23]

Unclear

Low

Low

Unclear

Unclear

Unclear

Unclear

Low

The (2007) [24]

Low

Low

Low

Low

Low

Low

Unclear

Low

McDertmott (2006) [25]

Low

Low

Low

Low

Low

High

Low

Low

Stewart (1987) [26]

Unclear

Unclear

High

High

Low

High

High

Unclear

Rothschild (2002) [27]

Unclear

Unclear

Low

Low

High

High

Unclear

Unclear

Vermeulen (2004) [28]

Low

Low

Low

Low

Low

Low

Low

Low

Behan (1990) [29]

Low

Low

High

High

Low

Unclear

High

Unclear

Warren (1999) [30]

Low

Low

Low

Low

Low

Low

Low

Unclear

Kaslow (1989) [31]

Unclear

Low

Low

Low

Low

Unclear

Unclear

Low

Ockerman (2000) [32]

Unclear

Low

Low

Low

Low

Unclear

Unclear

Low

Cox (1991) [33]

Unclear

Unclear

Low

Low

Unclear

High

Low

Unclear

Tiev (1999) [34]

Unclear

Unclear

Unclear

Unclear

Low

Unclear

Unclear

Unclear

Willams (2002) [35]

Unclear

Unclear

Unclear

Unclear

Low

Unclear

Unclear

Unclear


*, Domains of quality assessment based on Cochrane tools for assessing risk of bias.

, Two domains referring to 'incomplete outcome data' in the Cochrane tools for assessing risk of bias.

, This study had a baseline imbalance in the subjective outcome values.

Abbreviations; Low (low risk of bias);/High (high risk of bias); Unclear (uncertain risk of bias).

Alraek et al. BMC Complementary and Alternative Medicine 2011 11:87   doi:10.1186/1472-6882-11-87

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