Table 3.

Change of urinary NGAL and its comparison between two groups; the values indicate mean±SD

Time	Group		Difference (95% CI)	P a
	Intervention group	Control group
Day 0	201.14±215.38	556.94±378.98	335.80±112.01 (−586.73-−124.86)	0.004
Day 5	119.58±48.64	496.38±440.63	376.80±110.98 (−612.76-−140.84)	0.004
Difference (95% CI)	81.56±236.03 (−61.07-224.20)	60.55±329.63 (−115.09-236.21)	21.01±108.94 (−202.52-244.54)	0.849
P b	0.237	0.474

^aIndependent samples t-test, ^bPaired samples t-test. CI=Confidence interval, NAC=N-acetylcysteine, NGAL=neutrophil gelatinase-associated lipocalin, SD=standard deviation