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American Journal of Epidemiology Vol. 120, No. 3: 414-422
Copyright © 1984 by The Johns Hopkins University School of Hygiene and Public Health

research-article

THE DETERMINANTS OF ACTINIC SKIN DAMAGE: PROBLEMS OF CONFOUNDING AMONG ENVIRONMENTAL AND CONSTITUTIONAL VARIABLES

C. D. J. HOLMAN1,2, P. R. EVANS1, G. J. LUMSDEN1 and B. K. ARMSTRONG1,

1NH & MRC Research Unit in Epidemiology and Preventive Medicine, Department of Medicine, University of Western Australia Nedlands 6009, Western Australia
2Department of Epidemiology, Harvard School of Public Health Boston, MA

Reprint requests to Dr. Armstrong

Constitutional and environmental determinants of actinic skln damage, assessed by cutaneous microtopography, were evaluated In 1,216 subjects attending the 1981 Busselton Health Survey in Western Australia. Increasing age, male sex, the tendency to burn on exposure to sunlight and outdoor accupation were found to have independent predictive value for the presence of actinic skln damage. Crude positive and inverse associations of actinic skin damage with several other tactors were shown to arise from confounding. Effect measures tor outdoor lelsure pursuits and sunscreen use were underestimated due to Inverse associations of these factors wtth older age, and inverse associations of high-xposure outdoor activities with poor skln response to sunlight. Associations of constitutional traits typical of fair individuals and sunscreen use with the tendency to bum resulted in overestimation of effect measures. Empirical relationships of actinic skln damage with certain leisure activities and with use of sunscreens were also confounded by sex. The results indicate a need for greater attention to confounding in nonexperimental skin cancer research.

epidemlologlc methods; skln neoplasms; sunburn; sunllght; sunscreening agents; ultraviolet rays


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