Table 2.

Statistical evaluation about the conventional methods and the Carba-Screen results comparison.

Statistical evaluations
Sensitivity (culture positive samples which also tested positive to Carba-Screen techniques)	100%
Specificity (culture negative samples which also tested negative to Carba-Screen Techniques)	76.3%
Positive predictive value (positive REALQUALITY Carba-Screen kit samples which also tested positive to culture methods)	55.8%
Negative predictive value (negative REALQUALITY Carba-Screen kit samples which also tested negative to culture methods)	100%
Agreement (global percentage indicating the number of REALQUALITY Carba-Screen kit result which matched the culture methods results)	81.7%
Accuracy (capability to match all the true positive among the involved samples)	100%

The invalid samples evaded the statistical evaluations. The agreement to the culture-based methods was calculated based on the number of Carba-Screen tests which perfectly matched the culture assays. Consequently, all the positive Carba-Screen results which tested negative after the culture assay were considered as discrepancies. The accuracy percentage accounted for all the true positive samples, also including culture negative results which tested positive after the application of a conventional molecular method (Cepheid GeneXpert Carba-R) and the REALQUALITY Carba-Screen Kit.