Acupuncture or Acupressure at the Sanyinjiao (SP6) Acupoint for the Treatment of Primary Dysmenorrhea: A Meta-Analysis

Table 3

Quality assessment of trials identified in the literature search: risk of  bias.

	Sequence generation adequate	Allocation concealment adequate	Blinding adequate	Incomplete outcome data addressed	Free of selective reporting	Free of other bias
Acupuncture trials
Shi et al., 2011 [19]	+	+	+	+	?	?
Liu et al., 2011 [17]	+	+	+	+	+	?
Ma et al., 2010 [18]	+	+	+	+	?	?
Yu et al., 2010 [20]	+	+	−	+	?	?
Acupressure trials
Mirbagher-Ajorpaz et al., 2011 [21]	+	−	−	+	?	?
Kashefi et al., 2010 [22]	−	−	+	+	?	?
Wong et al., 2010 [23]	−	−	−	+	?	?
H. M. Chen and C. H. Chen, 2004  [24]	−	−	−	+	?	?

+: low risk of  bias; −: high risk of  bias; ?: unclear risk of  bias.