Kim 2009.

Methods	Single‐centre study in Korea
Participants	50 patients undergoing elective arthroscopic shoulder surgery 4 patients were excluded because of incomplete data; no other exclusion criteria were described
Interventions	Room temperature irrigation fluid (n = 23): volume irrigated 10.3 ± 4.3 litres, surgical time 91.1 ± 32.4 minutes Warmed irrigation fluid to 37°C to 39°C (n = 23): volume irrigated 9.8 ± 3.2 litres, surgical time 94.5 ± 21.9 minutes
Outcomes	Core temperature (oesophageal) measured every 20 minutes; shivering; fall in haemoglobin
Notes	No shivering score was used
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Randomly assigned
Allocation concealment (selection bias)	Unclear risk	Not described
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not described
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Shivering detected by an independent observer
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	4 excluded because of incomplete data
Selective reporting (reporting bias)	Low risk	No evidence of this
Other bias	Low risk	None