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Table 2 Baseline characteristics of critically ill pH1N1 patients, stratified by AKI

From: Acute kidney injury among critically ill patients with pandemic H1N1 influenza A in Canada: cohort study

Characteristic Overall AKI No AKI P value
(n = 562) (n = 342) (n = 220)
Age (yr) 48.0 (15.0) 49.1 (15.1) 46.4 (14.8) 0.03
Female sex 300 (53.4) 177 (51.8) 123 (55.9) 0.34
Ethnicity (n=555, 336, 219)     0.23
   White/Caucasian 327 (58.9) 204 (60.7) 123 (56.2)  
   Unknown/Mixed/Other 117 (21.1) 68 (20.2) 49 (22.4)  
   Aboriginal 74 (13.3) 47 (14.0) 27 (12.3)  
   Asian 37 (6.7) 17 (5.1) 20 (9.1)  
Any co-morbidity 513 (91.3) 316 (92.4) 197 (89.6) 0.24
   Obesity 150 (26.7) 118 (34.5) 32 (14.6) <0.0001
   Diabetes mellitus 146 (26.0) 107 (31.3) 39 (17.7) 0.0003
   Chronic obstructive pulmonary disease 98 (17.4) 56 (16.4) 42 (19.1) 0.41
   Alcohol abuse 74 (13.2) 41 (12.0) 33 (15.0) 0.30
   Chronic kidney disease 48 (8.5) 44 (12.9) 4 (1.8) <0.0001
H1N1 status
   Confirmed 479 (85.2) 291 (85.1) 188 (85.5) 0.90
   Probable 83 (14.8) 51 (14.9) 32 (14.6)
Days of symptoms pre-hospital (n = 532, 326, 206) 4.0 (2.0-7.0) 4.0 (2.0-7.0) 4.0 (2.0-7.0) 0.67
Days of symptoms pre-ICU (n = 549, 336, 213) 5.0 (3.0-8.0) 5.0 (3.0-8.0) 5.0 (3.0-8.0) 0.66
  1. AKI is defined by the RIFLE Injury or Failure categories and no AKI by the RIFLE None or Risk categories.
  2. Categorical data are presented as n (%) and continuous data as mean (SD) or median (Q1-Q3). For each variable, we specify (n) with data if it differs from the total in the first row.