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Percent of participants in each condition that provide a cannabis-negative urine specimen at each assessment time point from piecewise analysis. Missing specimens are considered cannabis-positive. ETX = end of treatment.
a: BRIEF vs. THERAPIST is significant (ETX: t(291)=2.22, p=0.03)
b: BRIEF vs. COMPUTER is significant (ETX: t(291)=2.03, p=0.04; 3M: t(291)=2.16, p=0.03)
