Higher accuracy scores were found for those who were MA-abstinent in the past year
compared to those who used MA in the past year, specifically for learning and spatial
memory after adjusting for demographic differences (Table 2). Speed was higher for pastyear
MA users, with a significant difference found for working memory speed. Lower
accuracy scores for working and delayed memory were found for regular crack/cocaine
users, however, unlike findings for MA users, speed scores were also lower. Consequently,
efficiency scores were lower for regular crack users compared to those who did not use
crack regularly, and statistically significant differences remained for spatial memory after
adjusting for demographics. Regular alcohol use to intoxication was associated with lower
learning accuracy. MA users who had not received drug treatment at study recruitment had
higher accuracy scores for learning, and higher speed and efficiency scores for spatial
memory compared to those who did receive treatment.