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First, a comment on Dr Voron's initial statement concerning Table 2. The average for each degree of dryness is weighted in the statistical analysis according to the number of patients in that category. The dryness score of 3 contained only four subjects, which meant that the percent improvement of 49% weighted much less in the final statistical analysis than did the dryness score of 2 that contained 12 subjects with an average percent improvement of 41%. A superficial scan of this table clearly shows that dryness scores of 0 to 1 indicated that those subjects who had minimally dry skin showed improvement of 60+%, and those who had drier skin (with scores of 2 or 3) had only a 40+% improvement at 16 weeks.The most important argument against Dr Voron's first point, however, is that the statistical analysis showed an inverse correlation between dryness and clearing of
Swinyer LJ, Swinyer TA, Britt MR. Treatment of Acne-Reply. JAMA. 1981;245(1):30. doi:10.1001/jama.1981.03310260014010