Sunbathing
  Exposure Situation
Risk of
NMSC at age
70 (%)
Indoor worker, no
sunbathing
2-3
Indoor worker,
sunbathing    2 wks / year
10-15
Indoor worker,
sunbathing    4 wks / year
20-60
Diffey et al: Photoderm 1987, 4, 118-26