Figusre 58 is a forest plot. Weighted mean differences were reported or calculated for two studies, with a pooled weighted mean difference of −1.61 (95% confidence interval −5.20 to 2.26) and an overall I-squared value of 90.5%.

Figure 58Acupuncture versus sham for chronic tension headache: effects on pain

ACP = standard needle acupuncture; = confidence interval; LACP = laser acupuncture; = standard deviation; = weighted mean difference

From: Results

Cover of Noninvasive Nonpharmacological Treatment for Chronic Pain: A Systematic Review Update
Noninvasive Nonpharmacological Treatment for Chronic Pain: A Systematic Review Update [Internet].
Comparative Effectiveness Review, No. 227.
Skelly AC, Chou R, Dettori JR, et al.
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