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