Comparison 3. Forced‐air warming vs warm water circulation systems.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Surgical site infection	3	208	Risk Ratio (M‐H, Random, 95% CI)	3.00 [0.62, 14.53]
2 Participants transfused	2	108	Risk Ratio (M‐H, Random, 95% CI)	1.59 [0.48, 5.24]
3 Blood transfusions	3	144	Mean Difference (IV, Random, 95% CI)	136.21 [‐119.10, 391.51]
4 Blood loss (ml)	6	345	Mean Difference (IV, Random, 95% CI)	9.39 [‐196.71, 215.50]
5 Fluids infused (ml)	4	230	Mean Difference (IV, Random, 95% CI)	‐215.11 [‐519.20, 88.99]
6 Chills/shivering	3	123	Risk Ratio (M‐H, Random, 95% CI)	1.84 [0.17, 19.64]