Ho 2009.

Methods	Randomised study performed at the IVF centre of China Medical University Hospital in Taiwan
Participants	A total of 44 women were enrolled in the study: 30 were randomised to acupuncture group and 14 to the control (no‐acupuncture group). The two groups were described as comparable for demographics including age and cause of infertility
Interventions	The study compared electro‐acupuncture (twice a week for two weeks, from cycle day 2 to the day prior to oocyte retrieval) with no acupuncture around the time of oocyte retrieval
Outcomes	Outcome measures studied were clinical pregnancy and the pulsatility index (PI) of left and right uterine arteries
Assisted conception protocols	Protocol breakdown not provided
Notes	The study was designed to assess the impact of acupuncture on uterine artery blood flow and clinical pregnancy rate
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not stated
Allocation concealment (selection bias)	Unclear risk	‘randomly assigned to one of the two groups by selection of a sealed envelope.’
Blinding (performance bias and detection bias) All outcomes	High risk	Control group received no treatment
Incomplete outcome data (attrition bias) All outcomes	High risk	30 randomised to acupuncture group, and 26 to control group (but 12 in the control group dropped out), leaving 30 in the acupuncture group and only 14 in the control group.
Selective reporting (reporting bias)	Unclear risk	No LBR outcome data reported.
Other bias	Low risk	None known