Table 3.

Comparisons of the cardiac surgery-associated acute kidney injury positive and negative cases using unpaired t-test

Parameters	CSA-AKI present (n=49)		CSA-AKI absent (n=51)		Two-tailed (P)
	Mean±SD	95% CI	Mean±SD	95% CI
Age (years)	38.53±13.25	34.71-42.34	35.54±11.20	32.39-38.70	0.2268
Weight (kg)	49.59±6.72	47.66-51.52	49.21±6.69	47.33-51.10	0.7798
eGFR (ml/1.73 m2)	68.97±18.73	63.53-74.42	66.56±19.15	61.22-71.90	0.5261
CPB time (min)	103.83±37.6	93.02-114.65	85.66±46.74	72.50-98.82	0.0351
X-clamp (min)	81.44±30.99	72.53-90.35	64.49±40.24	53.16-75.82	0.0206
Intraoperative UO (ml/kg/h)	5.89±1.25	5.53-6.25	6.32±1.17	5.99-6.65	0.0775
POD 1 UO	1.12±0.20	1.06-1.18	1.15±0.23	1.09-1.22	0.3928
POD 2 UO	1.11±0.21	1.065-1.17	1.14±0.22	1.07-1.20	0.5348
POD 3 UO	1.12±0.19	1.07-1.18	1.17±0.25	1.10-1.25	0.2728
POD 4 UO	1.16±0.21	1.10-1.22	1.17±0.27	1.09-1.25	0.8555
POD 5 UO	1.16±0.22	1.10-1.23	1.16±0.20	1.10-1.22	0.9956
Serum creatinine (mg%)
Preoperative	0.93±0.20	0.87-0.99	1.04±0.19	0.99-1.10	0.0044
POD 1	1.32±0.36	1.22-1.43	1.08±0.19	1.02-1.13	<0.0001
POD 2	1.40±0.44	1.28-1.53	1.04±0.21	0.98-1.10	<0.0001
POD 3	1.40±0.49	1.26-1.54	0.96±0.20	0.90-1.01	<0.0001
POD 4	1.31±0.39	1.20-1.43	0.93±0.24	0.86-1.00	<0.0001
POD 5	1.21±0.38	1.10-1.32	0.90±0.16	0.86-0.95	<0.0001
Blood urea (mg%)
Preoperative baseline	31.28±16.47	26.54-36.02	31.31±19.15	25.92-36.70	0.9938
POD 1	44.75±13.79	40.78-48.72	37.39±13.79	33.52-41.26	0.0088
POD 2	49.59±13.53	45.70-53.48	37.27±13.13	33.57-40.97	<0.0001
POD 3	51.89±15.38	47.47-56.32	35.15±13.69	31.30-39.01	<0.0001
POD 4	48.10±17.10	43.18-53.02	33.54±11.96	30.18-36.91	<0.0001
POD 5	42.75±17.61	37.69-47.82	32.98±11.40	29.77-36.19	0.0013

eGFR: Estimated glomerular filtration rate, UO: Urine output, CPB: Cardiopulmonary bypass, X-clamp: Aortic cross clamp, SD: Standard deviation, CI: Confidence intervals, POD: Postoperative day, CSA-AKI: Cardiac surgery-associated acute kidney injury