Table 3.

Overview of the data collection for the present implementation study

	Telephone interview	First questionnaire	Second questionnaire
Timing	April 2017 – August 2017 (after HCP had worked on average 4.5 months with the SFP referral tool)	March 2018	November 2018
Instruments	Semi-structured telephone interview based on the framework of Linnan and Steckler (2002) [32]. The interview guide included seven open and closed questions	MIDI with five additional open and closed questions	Qualitative questionnaire including three open questions
Aims	To collect in-depth data on the barriers and facilitators on the implementation of the SFP referral tool (experienced by HCP)	To identify multiple determinants (e.g., self-efficacy and relevance) that affected the use of the SFP referral tool by HCP	To prioritize the barriers that HCP experienced in using the SFP referral tool and to find suggestions to overcome these barriers
Number of HCP approacheda	35	59	62
Number of HCP completedb	25 (71.4 %)	31 (52.5 %)	32 (51.6 %)

Notes.HCP healthcare professionals; MIDI Measurement Instrument for Determinants of Innovations; SFP Smoke-free Parents

^a The number of approached professionals differed between the questionnaires and telephone interview, because healthcare professionals could register for the study, while the data collection had already started

^b Nine (13.2 %) healthcare professionals completed all three assessments