Skip to main content

Table 1 Sample size determination for time to development of surgical site infection and its predictors among general surgery patients at specialized hospitals

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]