Table 1.

Sample Characteristics (N = 93)

Pretreatment characteristic	Mean (Standard deviation)/%
Age	26.1 (7.5)
% Female	14.0
% Caucasian	19.4
% Married/cohabiting	10.8
% High school education	58.1
% Unemployed	38.7
Days of substance use in 28 days prior to treatment
Marijuana	15.8 (9.8)
Cigarette	18.8 (12.6)
Alcohol	2.3 (3.6)
% Daily cigarette smokers	63.4
Delay discounting score (natural logarithm of k)	−3.2 (0.9)