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Christopher E. M. Griffiths, MD, MRCP; Timothy S. Wang; Ted A. Hamilton, MS; John J. Voorhees, MD; Charles N. Ellis, MD

Arch Dermatol. 1992;128(3):347-351.

Abstract
Background and Design.—
The assessment of the severity of cutaneous photodamage and its response to treatment is an impractical consideration for most practitioners without extensive experience or recourse to high-quality, standardized, baseline photographs. To address this problem, a ninepoint photonumeric standard scale was developed using photographs of subjects representing grades of photodamage from none to severe. This scale was formally tested in a side-by-side comparison with a conventional and widely used written descriptive scale. A panel of seven graders used both scales to score two sets of 25 photographs of photodamaged individuals, and the intergrader agreement and repeatability for the scales were calculated.

Results.—
The photonumeric scale demonstrated significantly greater agreement between graders than did the descriptive scale (chance-corrected agreements of 0.31 and 0.11, respectively, P<.0001) with no significant difference in repeatability between the two methods.

Conclusions.—
This study demonstrates that the photonumeric standard scale is superior to existing methodology in the accurate assessment of cutaneous photodamage and would be a useful adjunct to studies of the efficacy of skin repair agents for this indication.

(Arch Dermatol. 1992;128:347-351)

Author Affiliations
From the Dermatopharmacology Unit, Department of Dermatology, University of Michigan Medical Center, Ann Arbor.

Footnotes
Accepted for publication August 2, 1991.

Reprint requests to Department of Dermatology, University of Michigan Medical Center, 1910 Taubman Center, Ann Arbor, MI 48109-0314 (Dr Griffiths).

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