 The statistic analysis of data will be realised with the use of computational parcel of SISS 15.0 for Windows. Data will be compared between bacteremia and no bacteremia groups. The investigation of relation of various potential risk factors with the repercussion of bacteremia, will be realised with the bivariate and multivariate analysis and the statistical method of simple accountant regression simple Logistic Regression and multiple accountant regression multiple Logistic Regression. The odds ratio OR and linear coefficient will be calculated and presented with 95 CI. P0.05 will be considered statistically significant. 