ILC-OPI: impulsive lifestyle counselling versus cognitive behavioral therapy to improve retention of patients with opioid use disorders and externalizing behavior: study protocol for a multicenter, randomized, controlled, superiority trial

Table 2 Time plan for the study

	STUDY PERIOD
	Enrollment	Allocation	Post-allocation			Close-out	Follow-up
TIME POINT	-t ₁	0	*Session 1–2*	*Sessions 3–7*	*Sessions 8–14*	t _x	*3 months*	*6 months*
ENROLLMENT:
Eligibility screen	X
Informed consent	X
*No other procedures*	X
Allocation		X
INTERVENTIONS:
*CBT/MI with voucher reinforcement for attendance*			Assessment	Treatment planning	Work on high-risk situations for drug use	Continued opioid agonist treatment	X	X
*Impulsive lifestyle counselling with voucher reinforcement for attendance*			Assessment	Treatment planning	Impulsive Lifestyle Counselling	Continued opioid agonist treatment	X	X
ASSESSMENTS:
	YouthMap
*Outcome variables*			Current well-being and substance use (at each session)	Current well-being and substance use	Current well-being and substance use	Retention in treatment	Substance use, treatment, criminal behavior	Substance use, treatment, criminal behavior
*Other variables*			Attendance	Attendance	Attendance

ISSN: 1471-244X