Shao 2012.

Methods	Single centre RCT, China
Participants	160 ASA I or II patients aged 18 to 60 years scheduled for elective abdominal surgery Exclusions: abnormal temperature, systemic metabolic disease, infection, interruption of surgery for frozen section
Interventions	There were 32 intervention groups, each with 5 patients having a unique combination of the following five interventions 1) Heating of IV fluids to 37 ºC 2) Body wrap 3) Warmed, moist dressings at 37 ºC 4) Warmed irrigation fluids at 37 ºC 5) Heating blankets (Astropad plus)
Outcomes	Nasopharyngeal and rectal temperature at end of surgery
Notes	Data provided for each of the 32 groups. We combined these to compare groups where the only difference was body wraps, and comparisons between body wrap and heating blanket with the same co‐interventions
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"random sampling was applied"
Allocation concealment (selection bias)	Unclear risk	"random sampling was applied"
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	None reported
Blinding of outcome assessment (detection bias) Other outcomes	Unclear risk	None reported
Incomplete outcome data (attrition bias) All outcomes	Low risk	No loss to follow up
Selective reporting (reporting bias)	Unclear risk	No clear evidence
Other bias	Low risk	None expected