Comparison of hospitalized acute Q fever pneumonia patients (n = 154) with patients admitted with a community-acquired pneumonia (CAP) (n = 254) and with CAP patients with bacterial aetiology other than C. burnetii (n = 104).

IQR: interquartile range; COPD: chronic obstructive pulmonary disease.aChi-square test.bMann-Whitney U test.cInformation missing or unknown for seven Q fever pneumonia patients, 56 CAP patients and 24 bacterial pneumonia patients.dThree CAP patients who died on the same day as visiting the emergency department not included, two patients not included in the bacterial pneumonia group.eInformation missing for three Q fever pneumonia patients, 46 CAP patients and 19 bacterial pneumonia patients.fInformation missing or unknown for 36 CAP patients and 18 bacterial pneumonia patients.gInformation missing or unknown for 31 CAP patients and 13 bacterial pneumonia patients.hPneumonia Severity Index (PSI): risk class: I–III = low; IV = moderate; V = severe.iInformation missing for 29 CAP patients and 13 bacterial pneumonia patients.jChi-square test for trend.kConfusion, blood Urea nitrogen, Respiratory rate, Blood pressure, age≥65 (CURB-65) score: 0–1 = mild pneumonia; 2 = moderate pneumonia; 3–5 = severe pneumonia.lInformation missing for 27 CAP patients and 12 bacterial pneumonia patients.mSevere pneumonia is defined as PSI risk class ≥IV and/or CURB-score ≥2.