Figure 3.

Forest plots of risk factors associated with pulmonary artery enlargement (PAE) as defined by the main pulmonary artery diameters (A) and as defined by PA:Ao ratio (B). Variables in the multivariate regression model included: age, gender, smoking status (current vs. ex-smoker), smoking history, obesity, FEV₁% predicted, apnoea–hypopnoea index, resting O₂ saturation, median O₂ saturation and centre site. Abbreviations: aOR = adjusted odds ratio; CI = confidence interval, FEV₁ = forced expiratory volume in one second, AHI = apnoea–hypopnoea index; T90 = percentage of sleep recording time with oxygen saturation < 90%. * OR estimates in the fully adjusted model instead of median O₂ saturation. ** OR estimates in the fully adjusted model instead of median O₂ saturation and T90.