PMC

Mean days of drug use (average per month) over 15 months by number of drug users in social networks at intake

Mean days of patient’s drug use per month over 15 months by number of drug users in social networks at intake. (No patient named 5–6 drug users in their social networks at intake.)

Mean days of drug use (average per month) over 15 months by the presence of multiple drug users in social networks at each assessment. Patients were sorted by whether they named multiple drug users at each assessment (“always”), at no assessment (“never”), or at some assessments but not all (“occasional”).