MIC and categorical interpretation agreement among participating laboratories for each antibiotic
| Antibiotic | Total no. of results | Total no. of comparisons | Modal MIC range (mg/L) | % Agreement (no. of comparisons with concordant results/total no. of comparisons) by: | Modal MICs at categorical interpretation breakpoints | |
| Modal MIC (±1 log2) | Categorical interpretation | Total number | ||||
| Penicillin | 174 | 99 | 0.25–64 | 78.8% (78/99) | 86.5% (141/163) | 3/16 |
| Tetracycline | 166 | 129 | 0.5–32 | 89.1% (115/129) | 80.0% (124/155) | 16/22 |
| Erythromycin | 59 | 22 | 1–128 | 100.0% (22/22) | 97.7% (43/44) | 6/11 |
| Spectinomycin | 94 | 88 | 8–16 | 90.9% (80/88) | 97.9% (92/94) | 1/26 |
| Ceftriaxone | 174 | 102 | 0.004–0.125 | 86.3% (88/102) | 95.2% (157/165) | 7/19 |
| Ciprofloxacin | 174 | 110 | 0.004–32 | 84.5% (93/110) | 98.2% (167/170) | 3/22 |
| Cefixime | 86 | 41 | 0.008–0.25 | 92.7% (38/41) | 96.4% (81/84) | 2/15 |
| Azithromycin | 138 | 126 | 0.125–16 | 92.9% (117/126) | 96.4% (133/138) | 0/27 |
MIC, minimum inhibitory concentration.