Time-dependent analysis with adjusted hazard ratios (HR) for all-cause mortality according to β-blocker use in subgroups of patients with a diagnosis of acute bronchitis.

Abbreviations: HR, hazard ratio; CI, Confidence interval.
†Overt cardiovascular disease was defined as ischemic heart disease, heart failure, peripheral arterial disease, or stroke during follow-up.
§COPD was defined as a diagnosis of COPD (clinically or based on spirometry) during follow-up.