From: Time to development of surgical site infection and its predictors among general surgery patients admitted at specialized hospitals in Amhara region, northwest Ethiopia: a prospective follow-up study
Variable
Assumptions
Sample size
Reference
HR
Event
P (e)
Duration of the surgery > 120 min
2.57
36
0.2
188
[16]
Pre-operative hospital stays > 72 h
1.48
204
0.5
454
[17]