Analyze the Following Study According to the Criteria Set by Your

Analyze the following study according to the criteria set by your instructor:
William Elliott, a University of Chicago physician, has found a link between diagonal creases in earlobes and risk of heart disease. He investigated twenty-seven groups of people, each group containing two pairs of individuals matched for age, sex, and race: one pair with established coronary heart disease and another pair of healthy people. A single member of each pair also had creased earlobes. After eight years, a significantly greater number of people with ear creases had died of heart disease, whether or not they were known to have heart disease at the start of the study.
Elliott, who reported his findings at a meeting of the American Federation for Clinical Research, encourages other physicians to monitor patients with earlobe creases for symptoms of heart disease.
-Adapted from Science News