Fig. 1From: Using a mobile health application to support self-management in chronic obstructive pulmonary disease: a six-month cohort studyComputation of an alert threshold. Symptom score as recorded in patient’s computer tablet (top trace), histogram depicting data distribution (lower left plot), probability density function PDF (lower middle plot), cumulative density function CDF (lower right plot), with patient-specific alert threshold value derived from 95th centile of CDFBack to article page