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Table 2 Risk of bias of included RCTs*

From: Complementary and alternative medicine for patients with chronic fatigue syndrome: A systematic review

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
  1. *, Domains of quality assessment based on Cochrane tools for assessing risk of bias.
  2. , Two domains referring to 'incomplete outcome data' in the Cochrane tools for assessing risk of bias.
  3. , This study had a baseline imbalance in the subjective outcome values.
  4. Abbreviations; Low (low risk of bias);/High (high risk of bias); Unclear (uncertain risk of bias).