Table 3: Multivariate analysis of peri-operative factors associated with having an elective or delayed tracheostomy.

 

No vs. Elective

No vs. Delayed

Variable

RRR (95% CI)

p-value

RRR (95% CI)

p-value

ASA:

 1 - 2

 3 - 4

 

1

7.12 (2.75-18.39)

 

< 0.001

 

1

2.25 (0.82-6.19)

 

0.115

BMI

1.14 (1.03-1.26)

0.015

1.20 (1.08-1.34)

0.001

Smoking status:

 Non-smoker

 Ex-smoker

 Current smoker

 

1

10.05 (2.08-48.54)

27.24 (3.86-192.32)

 

 

0.013

0.004

 

1

0.88 (0.30-2.61)

3.97 (0.73-21.41)

 

 

0.823

0.109

RRR: Relative Risk Ratio; CI: Confidence Interval; ASA: American Society of Anesthesiologists physical status classification system; BMI: Body Mass Index.