Minimum inhibitory concentration (MIC) differences of various antibiotics for oral administration (group 1a) and topical use (group 1b) against Propionibacterium acne isolates
| Antibiotics | Group 1a (n=67) | Group 1b (n=26) | P value |
| Azithromycin | 0.032 (0.016–0.205) | 0.032 (0.018–0.117) | 0.652 |
| Clarithromycin | 0.047 (0.02–0.125) | 0.047 (0.016–0.125) | 0.912 |
| Clindamycin | 0.047 (0.023–0.125) | 0.047 (0.023–0.5) | 0.705 |
| Erythromycin | 0.032 (0.021–0.102) | 0.032 (0.016–0.125) | 0.950 |
| Doxycycline | 0.125 (0.047–0.38) | 0.158 (0.06–0.283) | 0.786 |
| Tetracycline | 0.25 (0.094–0.38) | 0.315 (0.094–0.5) | 0.266 |
The values were MIC (μg/mL) and were expressed as median (IQR).