Table 3.

Overview of included constructs, measurements, and sources.

Constructs		Measurements and sources	Purpose
Baseline (t=0): directly before the decision aid
	Demographics	Age, gender, education [52]	Sample description, attrition analyses, covariate(s) in (main) analyses
	Smoking behavior	Smoking status, motivation to quit, type of tobacco products, amount of tobacco consumption, amount of past cessation attempts, and cessation assistance utilization in the past 6 months [52]	Sample description, attrition analyses
	Nicotine dependence	Revised Fagerström Test for Nicotine Dependence (FTND-R) [53]	Sample description, attrition analyses, covariate in (main) analyses
	Productivity loss	iMTA Productivity Cost Questionnaire (iPCQ) [54]	Economic evaluation
	Health care utilization	Contacts with health care professionals (plus frequency) in the past 6 months, cessation assistance utilization (plus frequency) in the past 6 months [55]	Economic evaluation
	Quality of life	ICEpop CAPability measure for Adults (ICECAP-A) [56]	Economic evaluation
	Stages of decision making	Stage of Decision Making [57]	Sample description, attrition analyses, process information, covariate in (main) analyses
Follow-up (t=1): directly after the decision aid
	Stages of decision making	Stage of Decision Making [57]	Sample description, process information
	Decision	Decision after having used the decision aid (DA), not yet implemented	Sample description, process information
	Decision-making process	Decisional conflict scale [58], first item from the Preparation for Decision Making Scale [59]	Hypothesis testing, H4 (decisional conflict scale [58]); process information and additional studies (see “Data Analysis”)
	Knowledge	Self-developed knowledge scale [60]	Additional studies (see “Data Analysis”)
	Perceived autonomy support	The Virtual Care Climate Questionnaire [47]	Additional studies (see “Data Analysis”)
	Perceived competence	Perceived competence scale [48]	Additional studies (see “Data Analysis”)
	Evaluation questions	Regarding attention, clarity, satisfaction, and one open question	Process information
	Recruitment channels	N/Aa	Recruitment monitoring and analyses
Follow-up (t=2): 1 month after baseline
	Decision implementation	Implemented decision (choice) after having used the DA	Hypothesis testing, H2a and H3a
	Smoking (cessation) behavior	Prolonged abstinence; 7-day point prevalence abstinence; for users that did not successfully stop: type of tobacco products and amount of tobacco consumption [52]	Hypothesis testing, H1a (7-day point prevalence abstinence [52]); additional studies (see “Data Analysis”)
	Stages of decision making	Stage of Decision Making [57]	Sample description, process information
	Knowledge	Self-developed knowledge scale [60]	Additional studies (see “Data Analysis”)
Follow-up (t=3): 6 months after baseline
	Decision implementation	Implemented decision (choice) after having used the DA	Hypothesis testing, H2b and H3b
	Smoking (cessation) behavior	Prolonged abstinence; 7-day point prevalence abstinence; for users that did not successfully stop: type of tobacco products and amount of tobacco consumption [52]	Hypothesis testing, H1b and H3a (7-day point prevalence abstinence [52]); additional studies (see “Data Analysis”)
	Productivity loss	iPCQ [54]	Economic evaluation
	Health care utilization	Contacts with health care professionals (plus frequency) in the past 6 months, cessation assistance utilization (plus frequency) in the past 6 months [55]	Economic evaluation
	Quality of life	ICECAP-A [56]	Economic evaluation
	Decisional regret	Decision regret scale [61]	Additional studies (see “Data Analysis”)
Follow-up (t=4): 12 months after baseline
	Decision implementation	Implemented decision (choice) after having used the DA	Hypothesis testing, H2c
	Smoking (cessation) behavior	Prolonged abstinence; 7-day point prevalence abstinence; for users that did not successfully stop: type of tobacco products and amount of tobacco consumption [52]	Hypothesis testing, H1c and H3b (7-day point prevalence abstinence [52]); additional studies (see “Data Analysis”)
	Productivity loss	iPCQ [54]	Economic evaluation
	Health care utilization	Contacts with health care professionals (plus frequency) in the past 6 months, cessation assistance utilization (plus frequency) in the past 6 months [55]	Economic evaluation
	Quality of life	ICECAP-A [56]	Economic evaluation
	Decisional regret	Decision regret scale [61]	Additional studies (see “Data Analysis”)
	Evaluation questions	Regarding perceived decision support	Process information

^aN/A: not applicable.