As shown in Table 3, more frequent MA use in the past 30 days was associated with poorer
accuracy scores on learning, spatial memory and delayed memory, and higher speed scores
on spatial and delayed memory (p=.080 for number of days of past month MA use
predicting learning speed in multivariate analysis). Thus, efficiency scores showed no differences based on frequency of past month MA use. Lifetime months of MA use was
significantly related to poorer accuracy, slower speed and lower efficiency on several
cognitive tests, however, after adjusting for demographic characteristics (specifically age
and education level), findings were not statistically significant. Younger age at first MA use
was related to higher accuracy score on working memory.