Table 5.
Diagnostic efficiency/performance of MicroScan, ComASP, and CHROMagar COL-APSE and CMT.
| Parameter | MicroScan(A) | MicroScan(B) | ComASP(A) | ComASP(B) | CHROMagar | CMT |
|---|---|---|---|---|---|---|
| True Positive | 36 | 12 | 34 | 13 | 32 | 1 |
| True Negative | 32 | 10 | 33 | 11 | 30 | 83 |
| False Positive | 10 | 3 | 12 | 2 | 15 | 0 |
| False Negative | 6 | 1 | 5 | 0 | 7 | 0 |
| Total | 84 | 26 | 84 | 26 | 84 | 84 |
| Sensitivity (%) | 85.71 | 92.31 | 87.18 | 100 | 82.05 | 100.00 |
| Specificity (%) | 76.19 | 76,92 | 73.33 | 88.89 | 66.67 | 100.00 |
| PPV (%) | 78.26 | 80 | 73.91 | 92.31 | 68.67 | 100.00 |
| NPV (%) | 84.21 | 90.91 | 79.82 | 100 | 78.95 | 100.00 |
| VME (%) | 14.29 | 7.69 | 12.82 | 0 | 17.95 | NA |
| ME (%) | 23.81 | 23.08 | 26.67 | 8.83 | 33.33 | NA |
| CA (%) | 80.95 | 84.62 | 78.57 | 95.24 | 73.81 | NA |
| EA (%) | NC | NC | 78.57 | 66.67 | NA | NA |
ComASP (A) = Test on all Gram-Negative Bacteria. ComASP (B) = Test on only K. pneumoniae and E. coli. MicroScan (A) = Test on all Gram-Negative Bacteria. MicroScan (B) = Test on all isolates excluding E. cloacae, Salmonella and non-fermenting Gram-negatives except Pseudomonas. NA, not applicable. NC, not calculated due to absence of actual MICs in many isolates.