| Scale | Systemic therapy | Topical therapy |
|---|---|---|
| ++++ | Approx. 90% | Approx. 60% |
| +++ | Approx. 70% | Approx. 45% |
| ++ | Approx. 50% | Approx. 30% |
| + | Approx. 30% | Approx. 15% |
| +/− | Approx. 10% | Approx. 5% |
| – | Not defined | Not defined |
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