Fig. 8From: Hospitalisation and mortality in patients with comorbid COPD and heart failure: a systematic review and meta-analysisFunnel plot assessing publication bias. In the meta-analysis of studies reporting hazard ratios (HR) for the effect of heart failure (HF) comorbidity on all-cause mortality of chronic obstructive pulmonary disease patients (COPD), diagnosed with spirometry, with pseudo-95% confidence limits (dashed lines). Begg’s test for asymmetry (p = 0.002)Back to article page