Figure 1From: Observational study to characterise 24-hour COPD symptoms and their relationship with patient-reported outcomes: results from the ASSESS studyPrevalence and frequency of night-time, early morning and daytime COPD symptoms (N = 727).aA typical week refers to a week that the patient considered most usual for them during the previous month. COPD, chronic obstructive pulmonary disease.Back to article page