Fig. 1.
Mean scores for Factor 1 (compulsivity), Factor 2 (emotionality), Factor 3 (expectancy), and Factor 4 (purposefulness) of the Marijuana Craving Questionnaire-Short Form as a function of self-reported frequency of daily craving episodes (top panel) and duration of average craving episode (bottom panel) during the past week. Filled symbols indicate a significant (p < 0.05) difference from zero.