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American Journal of Epidemiology Vol. 146, No. 5: 413-417
Copyright © 1997 by The Johns Hopkins University School of Hygiene and Public Health
research-article |
Declining Effect of Latitude on Melanoma Mortality Rates in the United States
A Preliminary Study
From the Program in Epidemiology, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center 1100 Fairview Avenue North, MP474, Seattle, WA 98109-1024
Reprint requests to Dr. John A. H. Lee at this address
The gradient of mortality from melanoma of the skin with latitude among US whites was estimated from the slopes of semilogarithmic models fitted to the state-specific mortality rates and the latitudes of the states' capital cities. The upward gradient of mortality from north to south for malignant melanoma of the skin has been decreasing since 19501959, when data first became available, through 19601969, 19701979, and 19881992. By the early years of the 21St century, rates of melanoma mortality in the contiguous United States are expected to be unaffected by latitude. For the country as a whole, melanoma mortality rates have been rising for many years. This rise has become progressively slower, such that national rates have been projected to stabilize in the near future. While increasing geographic mobility has probably played a role in reducing the latitude effect, melanoma mortality rates may have reached levels at which increased exposure of US whites to sunlight has little incremental effect. Am J Epidemiol 1997;146:41317.
geography; melanoma; mortality; sunlight; time; whites
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