Table 3.
Descriptive statistics of minimum inhibitory concentrations (MICs) for Pseudomonas aeruginosa keratitis isolates to ceftazadime, ciprofloxacin, and tobramycin.
| N | Median (µg/ml) |
Mode (µg/ml) | MIC50 (µg/ml) | MIC90 (µg/ml) | Range | Susceptibility (%) | |
|---|---|---|---|---|---|---|---|
| Sheen + | |||||||
| ceftazidime | 34 | 2 | 1.5 | 2 | 8 | 0.75 - >256 | 85.3 |
| ciprofloxacin | 41 | 0.19 | 0.19 | 0.19 | 0.5 | 0.064 - 1 | 92.5 |
| tobramycin | 41 | 1.5 | 1.5 | 1.5 | 3 | 0.064 - 8 | 20.0 |
| Sheen - | |||||||
| ceftazidime | 103 | 2 | 1.5 | 2 | 8 | 0.75 – 16 | 98.1* |
| ciprofloxacin | 123 | 0.19 | 0.19 | 0.19 | 0.5 | 0.047 – 1.5 | 93.5 |
| tobramycin | 123 | 1.5 | 1.5 | 1.5 | 3 | 0.047 – 5 | 30.6 |
*significant difference between Sheen + and Sheen – strains by chi-square, p=0.01.