• Stopping further hair loss: in a clinical study setting, this has to be documented after intervals of at least 1 year by microscopic methods such as hair counts or increase of hair weight in a representative area of hair loss.
• Increase of visible hair density: this has to be documented by standardised scalp hair photography.11
The change of anagen/telogen ratio does not reliably assess the efficacy of a treatment against further progression of AGA because not all men and women with AGA have abnormal anagen/telogen ratios. In addition, some patients with long-standing telogen effluvium never develop AGA.12 Therefore, the trichogram cannot reliably measure the efficacy of a treatment against AGA.
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