Persson 2001.

Methods	Design: RCT Operative phase: intraoperative Withdrawals: 3/59 (5%) Setting: 1 centre (Sweden) Sample size: 59 Funding: not stated
Participants	Age (mean): 48.0 ‐ 48.3 years Gender (M/F): 0/59 ASA grade: I ‐ II Surgery type: elective (subtotal hysterectomy) Surgery duration (mean): < 2 hrs (79/91 mins) Anaesthesia type: general
Interventions	Intervention (ABSW): n = 29 Upper‐body forced‐air warming blanket (Warm‐Touch®, Mallinckrodt, USA) connected to a forced‐air blower (Warm‐TouchTM, Mallinckrodt, USA) Duration (mean): started approximately 15 mins after induction of general anaesthesia Temperature: set at 43° ‐ 46°C Body area covered: over the chest adjacent to the skin covering both arms Proportion covered: not stated Control: n = 30 Cotton blankets Body area covered: upper body Co‐interventions: Both participant groups had cotton blankets covering the body after surgery. No active warming was provided in the PACU Room temperature: 23.4° ‐ 23.5ºC
Outcomes	Blood loss (ml) Pain (VAS 0 ‐ 10) Shivering (the paper states that "shivering was reported in one patient in the warm group, but none in the control group") Other outcomes reported not included in the review: Analgesic requirements Dose of fentanyl Nausea/vomiting
Notes	Comparison 1 Results presented in graphs
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not reported
Allocation concealment (selection bias)	Low risk	Sealed, opaque envelopes
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not reported
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Nurses recording data of interest were blinded to the study
Baseline comparability of groups	Low risk	To a high extent according to Table 1
Co‐interventions equal between groups	Low risk	Yes
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	1 participant in the warm group was excluded because of intubation difficulties. 2 participants in the warm group were excluded as a result of an altered surgical procedure and re‐operation due to bleeding within 12 hrs respectively. In the postoperative period, 11 participants in the warm group and 7 in the control group did not fully complete the 48‐hr study protocol because of postoperative nausea and vomiting
Selective reporting (reporting bias)	Unclear risk	We did not have access to the protocol, therefore we cannot exclude risk of selective reporting with the information provided
Other bias	Low risk