Wound infection Wound infection \(\chi^{2}\)-value P-value
No Yes
pressure bandage after operation
No 20 0 5.056 0.035
Yes 25 7
T
1 26 5 3.578 0.167
2 18 1
3 1 1
N
0 33 1 11.541 0.004
1 6 5
2 2 0
3 4 1
M
0 45 7 - -