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Table 2 Characteristics of 19,468 patients with and without hospital-associated infections (HAIs) treated at Haukeland University Hospital, 2004-2011

From: Mortality related to hospital-associated infections in a tertiary hospital; repeated cross-sectional studies between 2004-2011

   HAIs   Prevalence of HAIs
All patients No Yes  
Characteristics n (%) n (%) n (%) P valuea %
All 19468 (100) 17806 (100.0) 1662 (100.0)   8.5
 Gender     <0.001  
  Women 10140 (52.1) 9378 (52.7) 762 (45.8)   7.5
  Men 9328 (47.9) 8428 (47.3) 900 (54.2)   9.7
 Age (years)     <0.001  
  0-14 2131 (10.9) 2076 (11.7) 55 (3.3)   2.6
  15-34 2447 (12.6) 2331 (13.1) 116 (7.0)   4.7
  35-54 3345 (17.2) 3084 (17.3) 261 (15.7)   7.8
  55-74 6113 (31.4) 5498 (30.9) 615 (37.0)   10.1
  >74 5432 (27.9) 4817 (27.1) 615 (37.0)   11.3
 Time period     0.005  
  Jan-Mar 4924 (25.3) 4512 (25.3) 412 (24.8)   8.4
  Apr-Jun 5010 (25.7) 4618 (25.9) 392 (23.6)   7.8
  Jul-Sept 4786 (24.6) 4391 (24.7) 395 (23.8)   8.3
  Oct-Dec 4748 (24.4) 4285 (24.1) 463 (27.9)   9.8
 Admission type     <0.001  
  Acute 12080 (62.3) 10918 (61.6) 1162 (70.2)   9.6
  Elective 7304 (37.7) 6810 (38.4) 494 (29.8)   6.8
 Surgery     <0.001  
  No 12543 (64.4) 11920 (66.9) 623 (37.5)   5.0
  Yes 6925 (35.6) 5886 (33.1) 1039 (62.5)   15.0
 Urinary tract      
 catheter     <0.001  
  No 16216 (83.3) 15162 (85.2) 1054 (63.4)   6.5
  Yes, permanent 2682 (13.8) 2150 (12.1) 532 (32.0)   19.8
  Yes, intermittent 570 (2.9) 494 (2.8) 76 (4.6)   13.3
 Use of antibiotics     <0.001  
  No 14372 (73.8) 14241 (80.0) 131 (7.9)   0.9
  Yes 5096 (26.2) 3565 (20.0) 1531 (92.1)   30.0
 Pre-prevalence period (days)b     <0.001  
  2 5182 (26.6) 5112 (28.7) 70 (4.2)   1.4
  3-5 4537 (23.3) 4339 (24.4) 198 (11.9)   4.4
  6-9 4133 (21.2) 3756 (21.1) 377 (22.7)   9.1
  10-15 2295 (11.8) 1938 (10.9) 357 (21.5)   15.6
  16-30 2258 (11.6) 1814 (10.2) 444 (26.7)   19.7
  >30 1063 (5.5) 847 (4.8) 216 (13.0)   20.3
 Charlson comorbidity indexc     <0.001  
  0 9758 (50.1) 9202 (51.7) 556 (33.5)   5.7
  1 3464 (17.8) 3125 (17.6) 339 (20.4)   9.8
  2 3234 (16.6) 2827 (15.9) 407 (24.5)   12.6
  3 1118 (5.7) 951 (5.3) 167 (10.0)   14.9
  4 420 (2.2) 377 (2.1) 43 (2.6)   10.2
  >4 1380 (7.1) 1236 (6.9) 144 (8.7)   10.4
  1. aBy chi-square test
  2. bTime from hospital admission to study inclusion
  3. cInformation was missing for 94 patients on Charlson comorbidity index and 84 on admission type