Study	Reason for exclusion
Ahn 2009	Intervention included Japanese style acupuncture.
Conboy 2008	Intervention included Japanese style acupuncture.
Danielsson 2001	Not randomised.
Fu 2005	Intervention included acupuncture and Chinese herbal medicine versus drug therapy.
Fugh‐Berman 2003	Not randomised.
Green 2010	Not randomised.
Highfield 2006	Not randomised.
Jin 2009	Intervention included electro‐acupuncture using body acupoints versus electro‐acupuncture using auricular acupoints.
Lim 2009	No mention of endometriosis.
Liu 2003	Intervention was moxibustion only.
Liu 2009	Interventions included: acupuncture versus acupuncture plus ear tapping versus acupuncture plus moxibustion.
Lundeberg 2008	Not randomised.
Qu 2007	No assessment of pain outcome.
Sanfilippo 2008	Not randomised.
Schnyer 2008	Intervention included Japanese style acupuncture.
Sun 2006	Allocation was made based on sequence of hospital admission.
Sun 2007	Interventions were auricular acupuncture versus body acupuncture.
Van Steirteghem 2009	Not randomised.
Vercellini 2009	Intervention was surgery, not acupuncture.
Wayne 2008	Intervention included Japanese style acupuncture.
Xia 2006	Intervention included acupuncture plus Chinese herbal medicine versus drug therapy.
Yan 2008	Participants were not specifically diagnosed with endometriosis. Cases included: anaemia, pelvic inflammatory disease, uterine adenomyosis, uterine leiomyoma and ovarian cysts.
Zhen 2009	Trial compared different methods of acupuncture: warming‐needle versus general acupuncture.