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Table 1 Characteristics of the study cohort on admission to the ICU stratified according to whether or not oliguria was present

From: The clinical relevance of oliguria in the critically ill patient: analysis of a large observational database

 All patients n = 8292Oliguria at admissionp value
No
n = 6242 (75.3%)
Yes
n = 2050 (24.7)
Urine output (ml/kg/h) median [IQR]0.9 [0.5–1.4]1.1 [0.8–1.6]0.3 [0.1–0.4]< 0.001
Age, years, mean ± SD59.2 ± 18.258.1 ± 18.362.5 ± 17.4< 0.001
Male, n (%)4928 (60.0)3724 (60.2)1204 (59.4)0.55
Severity scores, mean ± SD
 SAPS II score40.8 ± 17.537.9 ± 15.149.8 ± 20.8< 0.001
 SOFA score at admission6.2 ± 4.25.7 ± 3.87.6 ± 5.0< 0.001
 SOFA score at admission (without renal subscore)5.3 ± 3.75.1 ± 3.55.8 ± 4.2< 0.001
Type of admission, n (%)
 Surgical (non-trauma)2939 (37.2)2374 (39.9)565 (29.2)< 0.001
 Medical4335 (54.9)3063 (51.4)1272 (65.7) 
 Trauma569 (7.2)478 (8.0)91 (4.7) 
 Other48 (.6)40 (.7)8 (.4) 
Source of admission, n (%)
 Other hospital825 (9.9)625 (10.0)200 (9.8)< 0.01
 ER/ambulance3151 (38.0)2336 (37.4)815 (39.8) 
 OR/recovery room1569 (18.9)1304 (20.9)265 (12.9) 
 Hospital floor2117 (25.5)1529 (24.5)588 (28.7) 
 Other630 (7.6)448 (7.2)182 (8.9) 
Comorbidities, n (%)
 COPD1012 (12.2)737 (11.8)275 (13.4)0.06
 Cancer891 (10.7)684 (11.0)207 (10.1)0.29
 Metastatic cancer288 (3.5)205 (3.3)83 (4.0)0.11
 Hematologic cancer178 (2.1)126 (2.0)52 (2.5)0.16
 Insulin682 (8.2)496 (7.9)186 (9.1)0.12
 Heart failure, NYHA III/IV648 (7.8)445 (7.1)203 (9.9)< 0.001
 HIV infection56 (.7)33 (.5)23 (1.1)< 0.01
 Cirrhosis283 (3.4)188 (3.0)95 (4.6)< 0.001
 Immunosuppression259 (3.1)184 (2.9)75 (3.7)0.11
 Steroid therapy273 (3.3)208 (3.3)65 (3.2)0.78
 Chemotherapy239 (2.9)181 (2.9)58 (2.8)0.94
Organ support, n (%)
 Mechanical ventilation4227 (51.0)3184 (51.0)1043 (50.9)0.92
 Renal replacement therapy321 (3.9)97 (1.6)224 (10.9)< 0.001
 Vasopressor use2429 (29.3)1672 (26.8)757 (36.9)< 0.001
Type of organ failure, n (%) (alone or in combination)
 Respiratory1867 (22.5)1334 (21.4)533 (26.0)< 0.001
 Coagulation530 (6.4)345 (5.5)185 (9.0)< 0.001
 Hepatic885 (10.7)658 (10.5)227 (11.1)0.51
 CNS1972 (23.8)1435 (23.0)537 (26.2)< 0.01
 Renal1341 (16.2)524 (8.4)817 (39.9)< 0.001
 Cardiovascular2296 (27.7)1580 (25.3)716 (34.9)< 0.001
Number of organ failures, n (%)
 None1771 (21.4)1489 (23.9)282 (13.8)< 0.001
 1 organ2344 (28.3)1805 (28.9)539 (26.3) 
 2 organs1693 (20.4)1302 (20.9)391 (19.1) 
 3 organs1231 (14.8)883 (14.1)348 (17.0) 
 > 3 organs1253 (15.1)763 (12.2)490 (23.9) 
Sepsis, n (%)1543 (18.6)1041 (16.7)502 (24.5)< 0.001
ICU stay, median [IQR]3.0 [2.0–6.0]3.0 [2.0–6.0]3.0 [1.0–7.0]< 0.001
 In survivors3.0 [1.0–6.0]3.0 [1.0–6.0]3.0 [0.0–7.0]0.046
 In non-survivors3.0 [0.0–8.0]5.0 [1.0–10.0]2.0 [0.0–6.0]< 0.001
Hospital stay, median [IQR]10.0 [5.0–20.0]10.0 [6.0–20.0]8.0 [2.0–18.0]< 0.001
 In survivors11.0 [2.0–21.0]11.0 [2.0–21.0]11.0 [1.0–22.0]0.075
 In non-survivors5.0 [0.0–14.0]7.0 [1.0–15.0]3.0 [0.0–10.0]< 0.001
ICU mortality, n (%)1234 (15.2)700 (11.5)534 (26.8)< 0.001
Hospital mortality, n (%)1649 (21.1)983 (16.7)666 (34.5)< 0.001
  1. SD standard deviation, SAPS II Simplified Acute Physiology Score II, SOFA Sequential Organ Failure Assessment, ER emergency room, OR operating room, COPD chronic obstructive pulmonary disease, NYHA New York Heart Association, HIV human immunodeficiency virus, CNS central nervous system, ICU intensive care unit, IQR interquartile range. Percentages are calculated after excluding missing data