All statistically marginally significant prognostic factors which identified by univariate analysis ( P < 0.1) were entered into a Cox proportion hazards regression model with forward stepwise (Likelihood ratio) to identify independent predictors of VAP event.
Validity and reliability of the Persian version of the CPIS score are confirmed, and it is used widely in research studies to appraise suspected VAP in several studies.[ 13 14 ] Data analysis After data collection and initial data analysis, we observed a significant trend toward a higher incidence of VAP, developing over the course of MV in patients who did not receive zinc sulfate supplement.