Subjects who endorsed using cannabis `6 or more times in a lifetime' were given the 6 abuse items. With percent endorsements shown in brackets, these criteria assessed whether or not subjects' use of cannabis i) occurred during dangerous situations (36%), ii) caused legal or resulted in traffic problems (4%), iii) caused problems with family, friends or colleagues (14%), iv) caused physical or psychological problems (13%), v) occurred while doing something important (21%), and vi) caused subjects to miss school, work or appointments (8%). Dependence items were not included in our analyses because not all subjects met the more stringent criteria of `11 or more times in a month' before dependence criteria could be administered.
