Table 1. Coding frequency in the component constructs of the Theoretical Framework of Acceptability [27] from pharmacists' interviews in the Headstrong program.

Theoretical Framework of Acceptability (TFA) constructs [27]	Definition [27]	Code frequency (number of interviews with code)
Perceived Effectiveness	Anticipated effectiveness: the extent to which the intervention is perceived to be likely to achieve its purpose.	38 (9)
Burden	Anticipated burden: the perceived amount of effort that is required to participate in the intervention.	26 (9)
	Experienced burden: the amount of effort that was required to participate in the intervention.
Self-efficacy	The participant's confidence that they can perform the behaviour(s) required to participate in the intervention.	21 (9)
Ethicality	The extent to which the intervention has good fit with an individual's value system.	17 (7)
Intervention Coherence	The extent to which the participant understands the intervention and how it works.	16 (9)
Affective Attitude	Anticipated Affective Attitude: how an individual feels about the intervention, prior to taking part.	15 (7)
	Experienced Affective Attitude: how an individual feels about the intervention, after taking part.
Opportunity Costs	Anticipated opportunity cost: the extent to which benefits, profits, or values must be given up to engage in the intervention.	11 (7)
	Experienced opportunity cost: the benefits, profits or values that were given up to engage in the intervention.