Table 3.

Multivariate Cox proportional hazard model of risk factors associated with treatment failure of PTO^d

Variables	HRa (CI 95%)	P Valuec
Ageb
61 – 80 years	6.086 (2.459; 15.061)	<0.001
> 80 years	9.975 (3.591; 27.714)	<0.001
Need for blood transfusion	2.239 (1.138; 4.406)	0.020
Pseudomonas aeruginosa culture	2.700 (1.370; 5.319)	0.004

^aHazard Ratio

^bLess than or equal 40 years as reference

^cAll tests were two sided, and P values of <0.05 were considered statistically significant

PTO^d: posttraumatic osteomyelitis