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Table 1 Overview of measurements per visit

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

Measurement Baseline visit Follow-up visit 1 (day 50) Follow-up visit 2 (day 197) Follow-up visit 3 (day 379)
Demographic characteristics    
   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)