Superficial tissue depth Deep tissue depth Free flap skin Adjacent healthy skin Free flap skin Adjacent healthy skin Skin temperature [°F] 95.3±3.0 96.6±1.9 95.3±3.0 96.6±1.9 Skin oxygen saturation [%] 44.9±19.6 46.7±17.9 46.0±18.7 49.2±17.5 Relative postcapillary venous filling pressure [AU] 25.0±12.6 25.9±10.5 54.3±17.2 50.4±14.1 Capillary blood flow [AU] 16.7±13.9 22.7±16.4 108.8±36.9 143.2±52.1

Table 1: Absolute values (mean±SD) of skin temperature, skin oxygen saturation, postcapillary venous filling pressure and capillary blood flow of the free flap skin island and the adjacent healthy skin in a superficial tissue depth (2mm) and deep tissue depth (8mm). Temperature assessment was the same for superficial and deep tissue depth.