Table 3.

Covariates

Covariate	Source
Biopsychosocial data of general practitioners (age, gender, experience, type of doctor’s practice, data of medical assistants/nurses)	GP
Biopsychosocial data of patients (age, gender, marital status, educational level, smoking status of partner)	Patient
Characterisation of smoking behaviour (age at onset of smoking, pack-years, number of cigarettes per day, time to first cigarette after wake up, number of previous attempts to stop smoking)	Patient
Participants’ choice of behavioural dimension	GP
Number and duration of coaching/counselling sessions (per patient and in total)	GP
Person conducting the coaching/counselling (doctor or specifically trained medical assistant)	GP
Type of smoking cessation intervention used	GP
Dispense of decision aids	GP
Involvement of partner or peers into the coaching/counselling process	GP
Perceived partner or peer support	Patient
Perceived willingness of partner or peers to achieve the same change in behaviour	Patient

GP general practitioner