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. Author manuscript; available in PMC: 2012 Oct 22.
Published in final edited form as: Drug Alcohol Depend. 2010 Aug 8;112(3):247–250. doi: 10.1016/j.drugalcdep.2010.06.010

Table 1.

Discounting Rates and R2s on the Delay Discounting Task by Group

Group Median k value Mean of log
transformed k 		Standard deviation
of log transformed k
Nonsmoker + No SUD 0.039 4.411 0.998
Smoker + SUD 0.093 5.103 0.981
Nonsmoker + SUD 0.081 5.031 1.158
Smoker + No SUD 0.077 5.146 0.962

Note. Since delay periods were in month units, k values carry the reciprocal of months (i.e., month−1) as units. SUD = Substance Use Disorder. Median values are based on the individuals within each group.