METHODS	Thirty-seven healthy volunteers with fair skin types were randomized to receive an inorganic sunscreen with sun protection factor ( SPF ) 8 of 0 mg cm ( -2 ) , 0.5 mg cm ( -2 ) , 1 mg cm ( -2 ) , 1.5 mg cm ( -2 ) , or 2 mg cm ( -2 ) thickness on the upper body , approximately 25 % of the body area .\