Major factors greatly favoring development (high relative risk):
(1) increased times spent outdoors in an environment with a high surface reflectance of ultraviolet light (sand or water)
(2) living in latitudes from 0-29°, especially from age 0 to 5
Additional factors favoring development to a lesser degree (lower relative risk)
(1) living in latitudes from 30-39°
(2) increasing age (> 50 years of age)
(3) male gender (although this might be explained by occupational and outdoor exposures)
(4) working in a factory or as a machine operator
(5) eye color hazel-green
(6) never tan, always burn (Type I skin type)
(7) red-auburn hair color
(8) smoking
Protective factors:
(1) wearing regular glasses or sunglasses (I would assume protective eyewear in factories would function similarly).
(2) wearing a hat
(3) eye color blue-gray
(4) working predominantly indoors as a professional or office worker
