Buggy 1994.

Methods	Single centre RCT, Republic of Ireland
Participants	68 ASA 1 and 2 patients undergoing elective orthopaedic and plastic surgery on the limbs under general anaesthesia. Exclusion criteria: under 14 years or over 80 years, pyrexia, requirement for intraoperative blood transfusion, operations over 80 mins duration, requiring mechanical ventilation
Interventions	1) standard surgical drapes 2) reflective blanket plus standard surgical drapes
Outcomes	Nasopharyngeal temperature at 15, 30 and 45 minutes after induction Incidence of shivering, recorded by recovery room nurses and defined as 'readily detectable fasciculations and tremor of the jaw, neck, trunk and extremities lasting longer than 20 s' Patient reported feeling of being cold on visual analogue score
Notes	No IV fluids given
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"allocated randomly"
Allocation concealment (selection bias)	Unclear risk	"allocated randomly"
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	None reported
Blinding of outcome assessment (detection bias) Shivering	Low risk	Assessed by nurse blinded to allocation
Blinding of outcome assessment (detection bias) Other outcomes	Unclear risk	No blinding
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