Parameter	Units	Base Case	Uncertainty	Distribution	Source
Starting age	Years	66.90	42.2-91.6	Normal	Beyer-Westendorf et al[@265105]
Gender split	Proportion female	0.59	0.53-0.65	Beta	Beyer-Westendorf et al[@265105]
Hip arthroplasty (THA)	Proportion	0.50	0.45-0.55	Beta	Assumption
Knee arthroplasty	Proportion	1-THA			Assumption
High-risk patients	Proportion	0.10	0.09-0.11	Beta	Assumption
SSI incidence	Proportion	0.028	0.025-0.031	Beta	Hardtstock et al,[@265097] adjusted for SSI as reported in Anderson et al[@265106]
SSI incidence after surgery	Days	13.95			Hardtstock et al[@265097]
Surgical time with intraoperative warming	Minutes	116.09	104.48-127.7	Gamma	Frisch et al[@265096] adjusted given meta-analysis by Balki et al[@265107]
Hypothermia (active warming)
THA	Proportion	0.439	0.395-0.483	Beta	Frisch et al[@265096]
TKA	Proportion	0.326	0.293-0.359	Beta	Frisch et al[@265096]
Hypothermia (passive warming)	Proportion	0.964	0.868-1.000	Beta	Sari et al17
Surgical time without intraoperative warming	Minutes	114.15	102.74-125.57	Gamma	Frisch et al[@265096]
Additional time in PACU managing hypothermia	Minutes	3.90	3.51-4.29	Gamma	Eksert & Sir[@265108]
Time spent in PACU	Minutes	35.46	31.91-39.00	Gamma	Eksert & Sir[@265108]
High-risk patient risk factor: SSI (both superficial and deep)	RR	1.65	1.33-2.00	Log-normal
Hypothermia risk factor
Superficial SSI	RR	1.21	0.95-1.54	Log-normal	Geurts et al[@265103]
Deep SSI	OR	3.30	1.19-9.14	Log-normal	Frisch et al[@265094]
Superficial SSI risk factor: Ioban™ incise drapes	RR	0.31	0.28-0.35	Log-normal	Bejko et al[@265101]
Deep SSI risk factor: Ioban™ incise drapes	RR	0.29	0.28-0.35	Log-normal	Bejko et al[@265101]
SSI risk factor: Prevena™	RR	0.16	0.19-1.64	Log-normal	Singh et al[@265104]
Impact on hypothermia, Bair Hugger™	RR	0.71	0.64-0.78	Log-normal	Shaw et al[@265102]
Total cost, 3M™ Ioban™ incise drapes	Euros	7.50	6.75-8.25	Gamma	Assumed 1.5x SoC
Total cost, SoC clear incise drape	Euros	5.00	4.5-5.50	Gamma	Assumption
Total cost, 3M™ Bair Hugger™ pre- and intraoperative warming gown	Euros	13.89	12.50-15.28	Gamma	Macario & Clancy[@265109]
Total cost, SoC pre- and intraoperative warming gown	Euros	9.94	8.95-10.93	Gamma	Macario & Clancy[@265109]
Total cost, 3M™ Prevena™ Incision Management System	Euros	345.00	310.50-379.50	Gamma	3M data on file, rounded to the nearest €5
Total cost, SoC antimicrobial dressing	Euros	5.00	4.50-5.50	Gamma	Assumption
GW cost (no infection, per day)	Euros	296.32	266.69-325.95	Gamma	Haenle et al[@265082]
GW cost (infection, per day)	Euros	318.99	287.09-350.89	Gamma	Haenle et al[@265082]
OR cost (per day)	Euros	1343.26	1208.93-1477.58	Gamma	Assumed similar to ICU cost
ICU cost (per day)	Euros	1343.26	1208.93-1477.58	Gamma	Haenle et al[@265082]
PACU cost (per day)	Euros	296.32	266.69-325.95	Gamma	Assumed similar to GW
Outpatient physician visit cost (per day)	Euros	168.48	151.63-185.32	Gamma	Hardtstock et al[@265097]