Table 2.

General characteristics according RRT during ICU stay before and after propensity-scoring matching

CharacteristicBefore MatchingAfter Matching
No RRT (n=17,878)RRT 
(n=532)PNo RRT 
(n=502)RRT 
(n=502)P
Age (yr)63.9±17.664.1±15.50.7364.8±17.264.5±15.20.87
Men10,116 (56.6)318 (59.8)0.21302 (60.2)299 (59.6)0.98
Hypertension6032 (33.7)71 (13.3)<0.001128 (25.5)66 (13.1)<0.001
Diabetes mellitus3473 (19.4)114 (21.4)0.25107 (21.3)107 (21.3)1.00
Congestive heart failure3405 (19.0)217 (40.8)<0.001197 (39.2)203 (40.4)0.70
COPD3018 (16.9)78 (14.7)0.1886 (17.1)78 (15.5)0.49
Liver disease830 (4.6)70 (13.2)<0.00164 (12.7)64 (12.7)1.00
Solid tumors2737 (15.3)43 (8.1)<0.00144 (8.8)43 (8.6)0.91
Lymphoma280 (1.6)10 (1.9)0.5712 (2.4)10 (2.0)0.67
Metastatic cancer813 (4.5)10 (1.9)0.0038 (1.6)10 (2.0)0.63
Sepsis1868 (10.4)219 (41.9)<0.001188 (37.5)194 (38.6)0.70
SAPS on ICU admission14 (10–17)18 (13–22)<0.00117 (12–21)18 (13–21)0.48
SOFA on ICU admission5 (2–8)10 (7–14)<0.00110 (6–13)10 (6–14)0.62
Hyperkalemia1399 (7.8)205 (38.5)<0.001164 (32.7)190 (37.8)0.22
Azotemia (BUN>60 mg/dl)1456 (8.1)319 (60.0)<0.001289 (57.6)290 (57.8)0.95
Cumulative fluid balance > 5% body wt7035 (53.5)324 (76.8)<0.001312 (76.1)299 (75.5)0.84
Hyponatremia4930 (27.6)322 (60.5)<0.001273 (54.4)289 (57.6)0.50
Urine output <400 ml/24 h4150 (23.7)414 (84.8)<0.001360 (71.7)375 (74.7)0.95
Metabolic acidosis12,352 (69.1)476 (89.5)<0.001436 (89.2)446 (88.8)0.38
Alkali therapy955 (5.3)182 (34.2)<0.001161 (32.1)158 (31.5)0.84
Diuretic use during ICU stay7463 (41.7)259 (48.7)0.001228 (45.4)243 (48.4)0.38
  • Data are expressed as the mean±SD, n (%), or median (interquartile range). Alkali and diuretic therapy were considered only if administered before RRT.