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. Author manuscript; available in PMC: 2014 Jul 25.
Published in final edited form as: Drug Alcohol Depend. 2011 Dec 27;123(0):249–254. doi: 10.1016/j.drugalcdep.2011.11.019

Figure 2. Relationship between age of first use of methamphetamine (MA) and the difference between predicted versus actual years of education.

Figure 2

Note: N = 36 MA-dependent participants. Pearson correlation. Predicted education was predicted from cognitive battery scores and demographic characteristics (age, gender, ethnicity), using a regression model developed in healthy comparison subjects (N = 42). Positive difference scores indicate that predicted education was greater than actual years of education, while negative difference scores indicate that predicted education was less than actual years of education. Results show that larger (positive) difference scores were associated with a younger onset of MA use.