| Treatments | Control | Total | Khi2 | p | |
| Negative | Positive | ||||
| Dual therapy | 49 | 5 | 54 | 5.52 | 0.000 |
| Tritherapy | 47 | 7 | 54 | 11.82 | 0.000 |
| Quadritherapy | 48 | 6 | 54 | 2.38 | 0.000 |
| Total | 144 | 18 | 162 |
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