Table 3.
Summary of concordant (zero error and minor error) and nonconcordant (major error) readings of the in-house and commercial minimum inhibitory concentration strips against broth microdilution reference method
| In-house strip | Commercial strip | |||||
|---|---|---|---|---|---|---|
| Acceptability (%) | Outside±1log2 dilution (major error) | Acceptability (%) | Outside±1log2 dilution (major error) | |||
| Same reading as broth microdilution (zero error) | Within±1log2 dilution (minor acceptable error) | Same reading as broth microdilution (zero error) | Within±1log2 dilution (minor acceptable error) | |||
| Standardization and optimization stage (%) | ||||||
| ATCC 29213 | 17/30 | 13/30 | 0/30 | 2/30 | 12/30 | 16/30 |
| 30/30 (100) | 14/30 (46.67) | |||||
| Clinical isolates | 35/90 | 48/90 | 7/90 | 19/90 | 41/90 | 30/90 |
| 83/90 (92.2%) | 60/90 (66.67%) | |||||
| Validation stage (%) | ||||||
| ATCC 29213 | 20/30 | 10/30 | 0/30 | 15/30 | 12/30 | 3/30 |
| 30/30 (100) | 27/30 (90) | |||||
| Clinical isolates | 62/90 | 24/90 | 4/90 | 20/90 | 50/90 | 20/90 |
| 86/90 (95.5%) | 70/90 (77.78) | |||||
MIC=Minimum inhibitory concentration