Table 1. Study assessments in the ECOPD study.

Assessment	Visit 1 (baseline)	Visit 2 (12 months)	Visit 3 (24 months)	Visit 4 (36 months)
Anthropometric measurements
Height	√	√	√	√
Weight	√	√	√	√
Seated blood pressure	√	√	√	√
Resting oxygen saturation	√	√	√	√
Questionnaires
COPD epidemiological questionnaire	√			√
Medical history	√	√	√	√
Medications history	√	√	√	√
mMRC dyspnea scale	√	√	√	√
CAT	√	√	√	√
CCQ	√	√	√	√
Acute respiratory event/exacerbation assessment	√	√	√	√
Pulmonary function
Pre-bronchodilator spirometry	√	√	√	√
Post-bronchodilator spirometry	√	√	√	√
Impulse oscillometry	√	√	√	√
Chest CT
Inspiration	√
Expiration	√
Biomarkers
Blood samples	√			√
Urine samples	√			√
Induced sputuma	√			√
Pollutant exposure measures
Satellite remote sensing/district and county based sampling	Daily monitoring
Home monitoring/personal samplinga	√	√	√	√
Exercise capacity
6MWTa	√			√
CPETa	√			√

^a, subgroup A: completed by some participants. ECOPD study, Early Chronic Obstructive Pulmonary Disease study; COPD, chronic obstructive pulmonary disease; mMRC, modified British Medical Research Council; CAT, chronic obstructive pulmonary disease assessment test; CCQ, chronic obstructive pulmonary disease clinical questionnaire; CT, computed tomography; 6MWT, 6-minute walk test; CPET, cardiopulmonary exercise testing.