2) Consider the following data from a hypothetical case control study examining the relationship between tanning bed use in young adulthood and risk of melanoma History of Tanning Bed Use Yes No History of Tanning Bed Use (lifetime hours) None d) In a refinement to the original analysis, the investigators decided to categorize tanning bed use according to hours of lifetime exposure: 1-10hrs 11 - 20hrs >20hrs 1 - 10hrs: Cases 688 196 11 - 20hrs: >20hrs: Cases Controls 288 864 196 301 214 173 Controls Calculate the appropriate measure of association for each of the three categories of tanning bed use, using "None" as the reference category 864 154 90 44 Measure of Association 1.0 (reference)