College Students' Use of Caffeine and Its Relationship to Personality
57 female and 59 male college students completed the Caffeine Consumption Questionnaire (CCQ) and a number of personality measures. Results indicated some gender differences in the measures, and a significant positive correlation between caffeine use and extraversion. It is suggested that the CCQ allows general users and researchers a precise and consistent measure of caffeine use and can be used as a tool to pursue other potential relationships between student characteristics and caffeine use.
Landrum, R. Eric. (1992). "College Students' Use of Caffeine and Its Relationship to Personality". College Student Journal, 26(2), 151-155.