7. Overview of included studies (PICO) ‐ Obstetrics.

Study details	Population (surgery type)	CS detail	Intervention detail	Control detail	Outcomes reported (time point)
Khan 2017 (SALVO) RCT Registration: Prospective Country: UK N = 1356	Obstetrics (Caesarean section)	Timing of collection: intraoperative Washing: washed Transfusion threshold: No threshold System: Varied according to centre	Cell Salvage N = 669	Control N = 687	Transfusions (intraoperative or to discharge) Volume (intraoperative or to discharge) Hospital LOS (NA)

ANH: acute normovolemic haemodilution; AT: autotransfusion; CABG: cardiopulmonary bypass graft; CS: cell salvage; CVA: cerebrovascular accident; DVT: deep vein thrombosis; Hb: haemoglobin; Hct: haematocrit; LOS: hospital length of stay; MACE: major adverse cardiovascular events; MI: myocardial infarction; N: planned recruitment (as reported by the study); NA: not analysable; NR: not reported; PE: pulmonary embolism; PJI: prosthetic joint infection; RAP: retrograde autologous prime; RCT: randomised controlled trial; VTE: venous thromboembolism

"Registration: N/A" means 'not applicable' as the study was published before 2010
"Volume" refers to mean transfusion volume
"Transfusions" refers to number of people receiving an allogeneic transfusion