Fig. 1
From: Change in substance use among patients in opioid maintenance treatment: baseline to 1-year follow-up
Most used main drug categories within the 4 weeks prior to the 1-year follow-up (T1) (N = 131)
Note: Of N = 131 patients, N = 116 were still in treatment. “Opioids, illicit” includes heroin and opioids without prescription. “Stimulants” includes amphetamine, cocaine, crack, and other stimulants