Table 1.

Measures and coding instruments

Unit of measurement	Measurement	Coding instrument
Therapist	sequential coding of 20 verbal behaviours: question, reflection, advice with permission, permission seeking, affirm, emphasize control, support, advice without permission, confront, direct, opinion, raise concern, warn, facilitate, feedback, filler, self-disclosure, general information, structure, not encodable.	SCOPE (Motivational Interviewing Sequential Code for Observing Process Exchanges) [16]
	rating of 5 MI-core values and other relational ingredients on a 7-point global rating scale: acceptance, empathy, collaboration, evocation, autonomy.	MISC 2.1 (Motivational Interviewing Skill Code) [17]
	computing 5 summary scores: • ratio of reflections to questions, • percent open questions, • percent complex reflections, • percent MI-consistent techniques, • mean global ratings.	MITI 3.1.1 (Motivational Interviewing Treatment Integrity) [18] SCOPE SCOPE SCOPE SCOPE MISC 2.1
	registration of optional MI-components: decisional balance, importance ruler, confidence ruler, typical day/week, looking back, looking forward, exploring goals and values, querying extremes, developing change plan.	Registration: applied / not applied
Patient	sequential coding of 10 patient verbal behaviours: commitment, desire, ability, reasons, need, taking steps, other, ask, follow neutral, not encodable.	SCOPE
	rating of the level of patient self-exploration on a 7-point global rating scale.	MISC 2.1
	percent patient change talk.	SCOPE