The relative risks, absolute relative risks and number needed to harm of the events (mortality in the follow-up period at30 days, 6 months, 1 year and 3 years).

<p>The relative risks, absolute relative risks and number needed to harm of the events (mortality in the follow-up period at30 days, 6 months, 1 year and 3 years).</p

General characteristics of study cohort.

<p>General characteristics of study cohort.</p

Microbiological variables.

<p>Microbiological variables.</p

Significant univariate and multivariate Cox regression analyses predicting the probability of death at 1 year.

<p>Significant univariate and multivariate Cox regression analyses predicting the probability of death at 1 year.</p

General characteristics of patients lost to follow-up (1 year follow-up).

<p>General characteristics of patients lost to follow-up (1 year follow-up).</p

Study flow diagram.

<p>Abbreviations: AECOPD: chronic obstructive pulmonary disease exacerbation.</p

Kaplan-Meier survival curves in the follow-up period: at 30 days (part A), 6 months (part B), 1 year (part C), and 3 years (part D) from discharge after initial hospitalization.

<p>Continuous and dashed lines represent patients with and without 30-day readmission for AECOPD respectively.</p

Clinical and laboratory variables recorded at admission and during clinical course of index hospitalization.

<p>Clinical and laboratory variables recorded at admission and during clinical course of index hospitalization.</p

Study Outcomes.

<p>Study Outcomes.</p

Significant univariate and multivariate Cox regression analyses predicting the probability of a 30-day readmission.

<p>Significant univariate and multivariate Cox regression analyses predicting the probability of a 30-day readmission.</p