The full report is titled “Sunscreen and Prevention of Skin Aging. A Randomized Trial.” It is in the 4 June 2013 issue of Annals of Internal Medicine (volume 158, pages 781-790). The authors are M.C.B. Hughes, G.M. Williams, P. Baker, and A.C. Green.
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University of British Columbia
June 19, 2017
Adjusted for differences?
The authors seem to have failed to study, report, or adjust for differences in sun exposure in the two groups, negating their finding that skin differences were attributable to sunscreen use. As a board-certified MD specializing in preventive medicine, I believe that sunscreen-using patients could very likely have also chosen to reduce their UV exposure risk in other ways, including hat wearing and spending less time directly in sunlight -- when one sensitizes patients to the importance of acting to minimize UV exposure, patients will, quite appropriately, respond in more ways than merely applying sunscreen.
Sunscreen and Prevention of Skin Aging. Ann Intern Med. ;158:I–28. doi: 10.7326/0003-4819-158-11-201306040-00001
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Published: Ann Intern Med. 2013;158(11):I-28.
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