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Table 1 Subject demographic and clinical characteristics by receipt of antibiotics prior to admission*

From: Impact of prior outpatient antibiotic use on mortality for community acquired pneumonia: a retrospective cohort study

  Receipt of Antibiotics Prior to Admission
Variable Yes (n = 128) No (n = 605) p-value
Age, years (standard deviation) 58.2 (16.1) 59.7 (16.1) 0.3
Men 90 (70) 482 (86) 0.02
Admitted through emergency department 104 (81) 509 (89) 0.4
Admitted to intensive care within 24 hours 18 (14) 125 (20) 0.09
Preexisting Comorbid Conditions
   Congestive heart failure 16 (13) 90 (15) 0.5
   Chronic pulmonary disease 35 (27) 16 (22) 0.9
   History of stroke 10 (8) 72 (12) 0.2
   Chronic liver disease 3 (2) 34 (6) 0.1
   History of malignancy 12 (9) 59 (10) 0.9
   Renal insufficiency 13 (10) 58 (10) 0.8
History, Physical, Laboratory, and Radiographic Data    
   Altered mental status 12 (9) 56 (9) 0.9
   Respiratory rate > 30 per minute 10 (8) 64 (11) 0.3
   Systolic blood pressure < 90 mmHg 2 (2) 15 (2) 0.5
   Heart rate > 125 per minute 12 (9) 86 (14) 0.1
   Temperature < 95° or > 104° 0 (0) 20 (3) 0.04
   Arterial pH < 7.35 5 (4) 4 (7) 0.2
   Arterial oxygenation saturation < 90% 28 (22) 137 (23) 0.9
   Hematocrit < 30% 9 (7) 56 (9) 0.4
   Serum blood urea nitrogen > 30 mg/dL 27 (21) 120 (20) 0.8
   Serum glucose > 250 mg/dL 14 (11) 60 (10) 0.7
   Serum sodium < 130 meq/L 23 (18) 88 (15) 0.3
   Pleural effusion on chest radiograph 27 (21) 147 (24) 0.4
Pneumonia Severity Index    
   Class I-III 74 (58) 330 (54)  
   Class IV 45 (35) 198 (33)  
   Class V 9 (7) 77 (13) 0.2
  1. * Data are presented as number (%) or mean (standard deviation)