| Levels | HENE + Clindamycin | Clindamycin | p | ||
| N | % | n | % | ||
| Very good | 9 | 29.0 | 0 | 0 | <0.05 (χ2 = 16.236) |
| Good | 20 | 64.5 | 18 | 60.0 | |
| Moderate | 2 | 6.5 | 12 | 40.0 | |
| Poor | 0 | 0 | 0 | 0 | |
| Total | 31 | 100.0 | 30 | 100.0 | |