Risk of mortality per quartile increase of pulmonary artery (PA) to aorta (A) ratio#

Total populationNo COPDAll COPD+Mild COPDModerate-to-severe COPD
Q1 ≤0.64ReferenceReferenceReferenceReferenceReference
Q2 0.65–0.700.97 (0.74–1.28)0.93 (0.68–1.26)1.30 (0.65–2.60)0.46 (0.11–1.98)1.73 (0.64–4.70)
Q3 0.71–0.771.03 (0.78–1.35)0.93 (0.68–1.26)1.64 (0.81–3.33)0.91 (0.28–2.94)1.95 (0.69–5.46)
Q4 >0.771.19 (0.91–1.55)1.06 (0.79–1.43)2.03 (1.06–3.88)1.33 (0.41–4.31)2.78 (1.07–7.23)
p for trend0.200.740.020.620.03

Data are presented as n or hazard ratio per quartile increase in PA:A (95% CI), unless otherwise stated. Bold type represents statistical significance. COPD: chronic obstructive pulmonary disease. #: adjusted for age, sex, body mass index, smoking, diabetes mellitus and left ventricular systolic function; : additionally adjusted for COPD; +: the total number of COPD cases in the subgroups do not add up to the total number of all COPD cases, since COPD diagnosis in 15 out of 222 subjects was confirmed after reviewing medical charts and specialist letters, but severity could not be determined.