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. 2010 Mar;162(3):647–654. doi: 10.1111/j.1365-2133.2009.09436.x

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Journal compilation © 2010 British Association of Dermatologists

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Fig 5 — Changes in facial skin transepidermal water loss (TEWL) for the full study population and 24-week cohort. At 8 weeks, n=91 for the full population tretinoin group and n=97 for the full population niacinamide/peptide/retinyl propionate (NPP) regimen group; n=25 for both cohorts. At 24 weeks, n=25 for the tretinoin regimen cohort and n=23 for the NPP regimen cohort.