Efficacy of confrontational counselling for smoking cessation in smokers with previously undiagnosed mild to moderate airflow limitation: study protocol of a randomized controlled trial

Table 1 Overview of measurements per visit

Measurement	Baseline visit	Follow-up visit 1 (day 50)	Follow-up visit 2 (day 197)	Follow-up visit 3 (day 379)
Demographic characteristics	•
Smoking:
Tobacco use and quit attempts [41]	•	•	•	•
Fagerström Test for Nicotine Dependence (FTND) [42]	•
Health perception: (self-constructed questions)
health concerns	•	•	•	•
risk perception	•	•	•	•
self-exempting beliefs	•	•	•	•
Respiratory health complaints:
COPD diagnostic questionnaire [43, 44]	•
Medical Research Council (MRC) dyspnoea scale [45, 46]	•		•	•
Clinical COPD Questionnaire (CCQ) [47, 48]	•	•	•	•
Health-related quality of life:
EuroQol (EQ-5D) [39, 40]	•	•	•	•
Short-form 36-item questionnaire (SF-36) [49, 50]	•	•	•	•
Chronic Respiratory Questionnaire self-reported (CRQ-SR) [51, 52]	•	•	•	•
Mental health:
Beck Depression Inventory (BDI) [53]	•	•	•	•
Hospital Anxiety and Depression Scale (HADS) [54–56]	•	•	•	•
Cost diary: measurement of direct en indirect medical and non-medical costs [38]		•	•	•
Physical measurements:
Physical height and weight	•	•	•	•
Post-bronchodilator spirometry	•			•
Urine cotinine (only in self-reported quitters)		•	•	•

ISSN: 1471-2458