Skin flap necrosis Skin flap necrosis \(\chi^{2}\)-value P-value
No Yes
pressure bandage after operation
No 20 0 1.300 0.254
Yes 30 2
T
1 30 1 0.215 0.898
2 18 1
3 2 0
N
0 33 1 1.173 0.759
1 10 1
2 2 0
3 5 0
M
0 50 2 - -