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Table 1 Comparisons of baseline characteristics between survivors and non-survivors

From: Fluid intake-related association between urine output and mortality in acute respiratory distress syndrome

VariablesOverall
(n = 835)
Survivors
(n = 539)
Non-survivors
(n = 296)
P
Age (years)51.1 ± 16.447.8 ± 16.559.1 ± 16.4<  0.001
Male [n (%)]494 (59.1)314 (58.2)180 (60.8)0.472
Height [n (%)]171.2 ± 9.7171.8 ± 9.7170.2 ± 9.50.021
Weight [n (%)]79.7 ± 21.680.5 ± 22.078.2 ± 20.90.134
Ethnicity (Black, %)148 (17.7)90 (16.6)58 (19.5)0.294
Ethnicity (white, %)606 (74.9)401 (74.3)205 (69.2)0.111
Low tidal volume intervention [n (%)]443 (53.0)304 (56.4)139 (46.9)0.009
Comorbidities
 Leukemia [n (%)]17 (2.0)5 (0.9)12 (4.0)0.004
 Immunosuppression [n (%)]86 (10.2)41 (7.6)45 (15.2)0.001
 Diabetes [n (%)]118 (14.1)72 (13.5)46 (15.5)0.386
 Solid tumour [n (%)]16 (1.9)6 (1.1)10 (3.4)0.032
 Lymphoma [n (%)]9 (1.1)3 (0.5)6 (2.0)0.075
 Cirrhosis [n (%)]24 (2.8)12 (2.2)12 (4.0)0.136
 Elective surgery [n (%)]73 (8.7)46 (8.5)27 (9.1)0.774
 Pneumothoraces [n (%)]105 (12.5)68 (12.6)37 (12.6)0.961
 Chest tube [n (%)]210 (25.1)140 (25.9)70 (23.6)0.459
Biochemical indexes
 PaO2/FiO2 (mmHg)150.9 ± 69.8156.4 ± 71.2141.0 ± 66.00.002
 Maximum respiratory rate30.4 ± 10.829.7 ± 11.131.7 ± 10.20.011
 Maximum mean blood pressure (mmHg)101.9 ± 19.7103.3 ± 19.999.3 ± 19.20.005
 Minimum mean blood pressure (mmHg)61.8 ± 13.663.4 ± 13.859.0 ± 12.8<  0.001
 Maximum white blood cell (10^9/L)14.9 ± 10.215.0 ± 9.914.7 ± 10.60.672
 Minimum white blood cell (10^9/L)12.1 ± 9.012.3 ± 8.911.7 ± 9.30.366
 Minimum platelet count (10^9/L)161.7 ± 116.7169.7 ± 121.2147.3 ± 106.80.008
 Maximum serum creatinine (mg/L)1.67 ± 1.521.59 ± 1.541.80 ± 1.470.058
 Minimum serum sodium (mmol/L)136.9 ± 5.5136.9 ± 5.2136.9 ± 6.10.995
 Maximum serum sodium (mmol/L)139.3 ± 5.3139.2 ± 4.9139.3 ± 6.00.762
 Minimum serum albumin (g/dl)2.19 ± 0.57
(n = 726)
2.26 ± 0.58
(n = 469)
2.08 ± 0.54
(n = 257)
<  0.001
 Minimum serum bicarbonate (mmol/L)21.4 ± 5.421.9 ± 5.420.6 ± 5.10.001
Fluid records
 Fluid intake (ml/kg/24 h)66.2 ± 54.263.4 ± 52.571.4 ± 56.80.039
 Urine output (ml/kg/24 h)31.3 ± 25.133.2 ± 25.827.9 ± 23.40.003
 UO /FI0.75 ± 1.820.76 ± 0.920.72 ± 2.800.777
  1. Abbreviation: UO/FI Urine output/fluid intake