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Meta-analysis of the studies evaluating the effects of WA on primary dysmenorrhea. (A) WA vs NSAIDs, outcome: VAS. (B) WA vs NSAIDs, outcome: TER. (C) WA plus NSAIDs vs NSAIDs, outcome: TER. CI = confidence interval, IV = inverse variance, NSAIDs = nonsteroidal anti-inflammatory drugs, SD = standard deviations, TER = total effective rate, VAS = visual analog scale, WA = warm acupuncture.
