Chronic disease status was categorised according toMcCabe’s classification: non-fatal underlying disease or nounderlying disease, ultimately fatal underlying disease(<5 years expected survival) and rapidly fatal underlying disease(<1 year expected survival) [27]. Each clinical episode ofpneumonia was described separately. However, for patientswho developed more than one episode of VAP, only variablesrelated to the first episode of VAP were analysed.
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