Table 2

General characteristics of 356 patients with community-acquired pneumonia, according to detection of an infectious agent

CharacteristicWith agentWithout agentp Value*
N232124
Age (years), median (range)61 (18–94)66 (18–93)0.1
Men, n (%)128 (55.2)63 (50.8)0.4
Death, n (%)17 (7.3)11 (8.9)0.6
Hospital stay (days), median/n (range)7/190 (1–71)7/104 (1–82)0.3
Hospitalisation, n (%)211 (90.9)119 (96.0)0.1
ICU admission, n (%)53 (22.8)30 (24.2)0.7
Outpatients, n (%)21 (9.1)5 (4.0)0.1
Smokers, n (%)90/220 (40.1)37/119 (31.1)0.1
Alcohol use >80 g/day, n/N (%)31/221 (14)11/119 (9.2)0.2
Comorbidity, n (%)N=221N=119
 Any112 (50.7)66 (55.5)0.4
 Diabetes mellitus36 (16.3)19 (15.9)0.9
 COPD36 (16.3)23 (19.3)0.5
 Asthma12 (5.4)4 (3.4)0.5
 Cardiac failure38 (17.2)23 (19.3)0.7
 Liver damage14 (6.3)1 (0.8)0.03
 Renal disease4 (1.8)7 (5.9)0.08
Antibiotics prior to admission, n/N (%)48/220 (21.8)24/119 (20.2)0.8
Mental confusion, n/N (%)55/219 (25.1)22/115 (19.1)0.2
Hypotension, n/N (%)36/218 (16.5)26/119 (21.9)0.2
Shock, n/N (%)21/217 (9.7)9/119 (7.6)0.6
Respiratory rate, median/n (range)24/172 (18–48)24/99 (15–46)0.8
Pulse, median/n (range)95/214 (17–153)91/119 (10–180)0.1
Systolic blood pressure (mm Hg), median/n (range)120/178 (68–213)123/178 (70–195)0.6
Temperature at admission (°C), median/n (range)37.2/219 (35–41)37.4/117 (35–40.5)0.9
C-reactive protein (mg/dL), median/n (range)211/182 (2–569)158/101 (3–454)0.02
Chest radiograph, n (%)N=217N=115
 Interstitial patterns31 (14.3)12 (10.4)0.4
 Alveolar patterns173 (79.7)95 (83.3)0.5
 Both13 (5.9)8 (6.9)0.9
 Multilobar involvement70 (32.6)42/113 (37.2)0.4
  • Santiago, Chile, February 2005–December 2007.

  • *p by Kruskal–Wallis test.

  • COPD, chronic obstructive pulmonary disease; ICU, intensive care unit.