Measuring the success of acupuncture can be challenging as the area is really not conducive to be measured in Western scientific terms. Acupuncture does not treat any particular symptom, but really normalizes imbalances and promotes self healing of individuals. But for those looking for "evidence-based" information, here are pieces that present information as to the effectiveness of acupuncture for various conditions. 

• The Acupuncturist Evidence Project: Plain English Summary

• The Acupuncture Evidence Project: A Comparative Literature Review by John McDonald and Stephen Janz, January 2017. Commissioned by Australian Acupuncture and Chinese Medicine Association Ltd.

• Research Finds Acupuncture Effective for Chronic Pain (American Academy of Family Physicians)

• What Science Says About the Effectiveness of Acupuncture (National Center of Complementary & Integrative Health),