Figure 2

Summary of risk of bias for 10 studies in a systematic review comparing the outcome of applying spinal manipulative therapy at a candidate site versus a non-candidate site. The risk of bias was assessed using a modified version of the Cochrane Risk of Bias Tool for Randomized Controlled Trials. A ‘green + ’ indicates low risk of bias, a ‘red –’ indicates high risk of bias, and a ‘yellow ?’ indicates an unsure risk of bias.