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Table 3 Multivariate analysis using the Cox model

From: Risk factors and the resistance mechanisms involved in Pseudomonas aeruginosa mutation in critically ill patients

Significant covariates Risk ratio CI 95% p
Duration of ventilation > 24 days 4.29 1.94- 9.49 0.0003*
Initial resistance 0.36 0.18- 0.71 0.0031*
Non-model variables
 Ceftazidime after P. aeruginosa 1.66 0.82- 3.37 0.160
 Meropenem after P. aeruginosa 1.17 0.57- 2.40 0.674
  1. * signify that it is considered to be statistically significant with p < 0.05