247 Low-dose-CT versus X-ray in patients with pneumonia Table 1. Baseline characteristics, diagnosis, and outcomes ULD CT n = 261 CXR n = 231 P value General Age, yr, mean (SD) 57 (19) 58 (18) Female sex 126 (48) 104 (45) Antibiotic use for RTI or pneumonia prior to ED presentation 32 (12) 30 (13) Comorbidities Charlson Comorbidity Index1, median (IQR) 3 [1, 5] 3 [1, 5] Immunocompromised 64 (25) 67 (29) Malignancy 45 (17) 51 (22) Diabetes 50 (19) 43 (19) Pulmonary diseases Chronic obstructive pulmonary disease 36 (14) 36 (16) Asthma 33 (13) 21 (9) Interstitial lung disease 5 (2) 9 (4) Cystic fibrosis 6 (2) 4 (2) Cardiac diseases Myocardial infarction 38 (15) 30 (13) Chronic cardiac failure 20 (8) 21 (9) Neurological diseases 30 (12) 21 (9) Kidney disease 23 (9) 23 (10) Presenting symptoms Dyspnea 151 (58) 154 (67) Cough 191 (73) 174 (75) Fever 222 (85) 193 (84) Thoracic pain 97 (37) 84 (36) Sputum production 99 (38) 96 (42) Hemoptysis 13 (5) 13 (6) Confusion 8 (3) 11 (5) Vital parameters Oxygen provided on ED 51 (20) 47 (20) Respiratory rate, /min, mean (SD)2 21 (6) 20 (6) Systolic blood pressure, mmHg, mean (SD) 134 (25) 130 (22) Diastolic blood pressure, mmHg, mean (SD) 79 (15) 77 (13) Heart rate, /min, mean (SD) 98 (19) 100 (20) Temperature, degrees Celsius, mean (SD) 39 (1) 39 (1) 10
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