TABLE 2.
Categorical agreement of individual susceptibility results for direct versus standard methods
| Interpretive category | Overnight panels
|
Rapid panels
|
||||||
|---|---|---|---|---|---|---|---|---|
| No. of drugs tested | No. of concordant drugs (%) | No. of major errors (%)a | No. of very major errors (%)a | No. of drugs tested | No. of concordant drugs (%) | No. of major errors (%)a | No. of very major errors (%)a | |
| Gram negative | ||||||||
| Susceptible | 1,770 | 1,723 (97.3) | 1,656 | 1,620 (97.8) | ||||
| Intermediate | 106 | 63 (59.4) | 100 | 50 (50.0) | ||||
| Resistant | 374 | 344 (92.0) | 221 | 179 (81.0) | ||||
| Total | 2,250 | 2,130 (94.7) | 25 (1.4) | 10 (2.7) | 1,977 | 1,849 (93.5) | 11 (0.7) | 18 (8.1) |
| Gram positive | ||||||||
| Susceptible | 867 | 833 (96.1) | 558 | 535 (95.9) | ||||
| Intermediate | 20 | 4 (20.0) | 15 | 6 (40.0) | ||||
| Resistant | 231 | 205 (88.7) | 165 | 146 (88.5) | ||||
| Total | 1,118 | 1,042 (93.2) | 22 (2.6) | 18 (8.8) | 738 | 687 (93.1) | 14 (2.5) | 12 (7.2) |
a
Denominator for major error rate is total number of MICs indicating bacterium susceptibility by standard method, while that for very major errors is total number of MICs indicating bacterium resistance by standard method.