TABLE 1

Demographic information per main cause of breathlessness (total subjects=182)

Main cause of breathlessness	Attended at baseline	Age years	Female	BMI kg·m⁻²
COPD	45 (24.7%)	71.6±9.2	29	26.6±7.8
Asthma	39 (21.4%)	53.2±15.2	29	27.9±5.3
Heart failure	35 (19.2%)	76.4±7.9	8	30.5±5.7
IPF	34 (18.7%)	75.1±6.8	16	25.9±3.9
Other ILD	5 (2.7%)	69.3±11.7	2	28.4±4.5
Other diagnoses^#	24 (13.2%)	66.4±14.6	13	25.9±6.7
Number of patients with 1/2/3/4 comorbidities	50/16/4/1
Comorbidity frequency by diagnosis
COPD	Diabetes n=30; heart failure n=10; other breathlessness n=7; asthma n=5; cancer n=4; renal failure n=2
Asthma	Diabetes n=8; other breathlessness n=2; ILD n=2
Heart failure	Diabetes n=13; renal failure n=8; COPD n=4; other breathlessness n=2; asthma n=2; cancer n=2
IPF	Diabetes n=5; renal failure n=2; other breathlessness n=2; heart failure n=1; asthma n=1
Other ILD	Diabetes n=2; COPD n=1; heart failure n=1
Other diagnoses^#	Heart failure n=5; diabetes n=5; asthma n=3; renal failure n=2; cancer n=1; COPD n=1

Data are presented as mean±sd, n (%) or n. IPF: idiopathic pulmonary fibrosis; ILD: interstitial lung disease; BMI: body mass index. ^#: other diagnoses include depression, cancer, diabetes and renal failure.