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Comparison 12: Topical zinc versus no treatment, Outcome 6: Physicians' global evaluation of acne improvement (visual analogue scale)
| Physicians' global evaluation of acne improvement (visual analogue scale) | |||
| Study | Topical zinc (mean, SD) | No treatment (mean, SD) | P value |
| long term | |||
| Cunliffe 2005 | 16 weeks after start of treatment, Unclear | Unclear | No difference, no exact P value reported |
