3. Comparison 4. Acupuncture versus another intervention. Outcome: global measurement.

Study	Assessed term	Acupuncture	Another intervention	P value
Zhao 2012		(N = 30)	TENS (N = 30)
Measured immediately after	Very effective	9	5
	Effective	14	9
	Improved	6	14
	No change	1	2	z = 4.57; P < 0.05

TENS = Electroacupuncture