Fig. 2From: Eligibility of patients with chronic obstructive pulmonary disease for inclusion in randomised control trials investigating triple therapy: a study using routinely collected dataInclusion of people to study. COPD chronic obstructive pulmonary disease, HES hospital episode statistics, FEV1 forced expiratory volume in 1 s, CAT COPD assessment test. *Inclusion criteria: aged older than 40, registered with a GP, diagnosis of COPDBack to article page