In our study, the increase in the number of terminal hairs induced by finasteride was not accompanied by the decrease in the percentage of vellus hairs as it should have done if the pathogenetic mechanism of progressive miniaturization were the real mechanism producing hair rarefaction. A similar result had been obtained by Rushton et al. [3] and largely commented by Sinclair [4].

Limitations of our work were essentially those related to the large number of dropouts. We did not investigate the single reasons of that phenomenon, but considering that our study was exceedingly long and was not sponsored, and the subjects had no incentives

what do u imply?
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whatsoever, it was to be expected. Plausibly, only subjects who were encouraged by the clinical success remained in the study. This interpretation, however, proved wrong by some subjects who did not come at one step but reappeared at the following.