Comparison 2. Forced‐air warming vs electric and resistive heating systems.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Blood loss during surgery and up to 48 hours post‐surgery (ml)	5	270	Mean Difference (IV, Random, 95% CI)	‐3.68 [‐55.43, 48.07]
2 Fluids infused (ml)	3	184	Mean Difference (IV, Random, 95% CI)	101.59 [‐14.67, 217.85]
3 Participant's comfort (thermal)	2	120	Mean Difference (IV, Random, 95% CI)	0.07 [‐0.21, 0.35]
4 Chills/shivering	2	120	Risk Ratio (M‐H, Random, 95% CI)	1.31 [0.30, 5.74]