Figure 2From: How large are the nonspecific effects of acupuncture? A meta-analysis of randomized controlled trials The nonspecific effect of acupuncture (difference between groups receiving sham acupuncture and no acupuncture). SD, standard deviation; Total, number of patients; 95% CI, 95% confidence interval; IV, inverse variance method; Random, random effects model; df, degrees of freedom.Back to article page