A study in Sweden looked at former elite soccer players, people who had played soccer but not at the elite level, and people of the same age who did not play soccer. Here is a two-way table that classifies these individuals by whether or not they had arthritis of the hip or knee by their mid-fifties:

a. What percent of the people in this study were elite soccer players? What percent of the people in this study developed arthritis?

b. What percent of the elite soccer players developed arthritis? What percent of those who got arthritis were elite soccer players?

c. Researchers suspected that the more serious soccer players were more likely to develop arthritis later in life. Do the data confirm this suspicion? Calculate appropriate percentages to support your answer.

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Soccer level Elite Non-elite Did not play Whether Yes 10 9 24 person developed No 61 206 548 arthritis