Fig. 3. Percentage of Mac-1 positive lymphocytes from African-American subjects reading magazines (o) or undergoing a speech task (127). Data are presented as mean ± SE. Blood was drawn at BL, immediately after the speech/reading task (0), and 20 minutes after the task (20). The two groups showed a differential change across the session with a significant group x time interaction (F(2,54) = 3.2, p < .05).