Chen 2012.

Methods	Randomisation: random numbers table used to divide into 2 groups Allocation concealment: not reported Blinding of participants/investigators: not reported Blinding of assessors: not reported No. randomised: 134 No. analysed: 134 Intention‐to‐treat analysis: yes Power and sample calculations: not described Duration of trial: not stated
Participants	Patients undergoing IVF‐E
Interventions	1. Control: intramuscular (IM) Dolantin 50 milligrams (mg) 30 minutes before oocyte retrieval (N = 67) 2. Intervention: IM Dolantin 50 mg 30 minutes before electro‐acupuncture (N = 67)
Outcomes	1. Primary: intraoperative pain (World Health Organization pain scale: Grade I (scores 1 to 3, minimal pain), Grade II (scores 4 to 6, mild pain), Grade III (scores 7 to 9, moderate pain), Grade IV (scores 10 to 12, severe pain)): postoperative (1 hour (h), 2 hours postoperatively) abdominal pain 2. Secondary: side effects of analgesia
Notes	China Reproductive Medicine Centre Funding: Gansu Province Paper in Chinese NB. Data unclear, awaiting response from trial authors

IM = intramuscular