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Table 2 Risk of bias of selected studies

From: Efficacy of psychological treatment for headache disorder: a systematic review and meta-analysis

Study ID Randomization process Deviations from intended interventions Missing outcome data Measurement of the outcome Selection of the reported result Overall Bias
K. A. Foster et al., 2004 Some concerns Low Low Low Low Some concerns
E. B. Blanchard et al., 1991 Some concerns Low Low Low Some concerns Some concerns
E. B. Blanchard et al., 1991 Some concerns Low Low Low Some concerns Some concerns
T. Finn et al., 1991 Some concerns Some concerns Some concerns Low Some concerns Some concerns
H. Mo’tamedi et al., 2012 Some concerns Some concerns High Some concerns Low High
D. Kewman et al., 1980 Low Some concerns Some concerns Some concerns Low Some concerns
A. Kleiboer et al., 2014 Low Some concerns High Low Low High
P. D’Souza et al., 2008 Low Low Low Low Low Low
B. Meyer et al., 2016 Some concerns Some concerns Some concerns Low Low Some concerns
R. E. Wells et al., 2014 Low Low Low Some concerns Low Some concerns
V. Bembalgi et al., 2012 Low Some concerns Some concerns Low Low Some concerns
O. Slavin-Spenny et al., 2013 Low Some concerns Some concerns Some concerns Low Some concerns
H. Mansourishad et al., 2017 Some concerns Low Low Low Low Some concerns
E. H. Kang et al., 2009 Some concerns Some concerns Some concerns Some concerns Some concerns Some concerns
P. Bruhn et al., 1979 Some concerns Some concerns High Some concerns Some concerns High
K. A. Appelbaum et al., 1990 Some concerns Some concerns High Some concerns Some concerns High
V. Bembalgi et al., 2013 Low Some concerns Some concerns Low Low Some concerns
P. Martin et al., 2007 Some concerns Some concerns Low Some concerns Low Some concerns
L. A. Rokicki et al., 1997 Some concerns Some concerns Low Low Some concerns Some concerns
S. Cathcart et al., 2014 Low Some concerns Low Low Low Some concerns
J. Gauthier et al., 1983 Some concerns Some concerns Some concerns Low Some concerns Some concerns
G. Pickering et al., 2012 Low Some concerns Some concerns Low Low Some concerns
T. Devineni et al., 2005 Some concerns Some concerns Some concerns Some concerns Low Some concerns
S. Cousins et al., 2015 Low Some concerns Low Low Low Some concerns
E. Blanchard et al., 1990 Some concerns Some concerns Low Some concerns Some concerns Some concerns
E. B. Blanchard et al., 1990 Some concerns Some concerns Low Some concerns Low Some concerns
M. Odawara et al., 2015 Low Low Some concerns Low Low Some concerns
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