Table 2. Mean serum creatinine level by study group at the end of intervention .

Variable		Group			P value
		Saline normal n=75 Mean ± SD	NAC n=75 Mean ± SD	total n=150 Mean ± SD
Gender	Female (n = 83)	1.30±0.50	1.07±0.38	1.18±0.45	0.14
	Male (n = 67)	1.36±0.30	1.17±0.31	1.27±0.32
Hypertension	More than 140 mm Hg (n = 107)	1.42±0.47	1.10±0.33	1.24±0.43	0.27
	Lower than 139 (n = 43)	1.17±0.21	1.14±0.44	1.16±0.31
Diabetes mellitus	Yes (n = 109)	1.34±0.44	1.08±0.34	1.22±0.42	0.91
	No (n = 41)	1.30±0.30	1.17±0.36	1.21±0.35
ARB receivers	Yes (n = 15)	1.35±0.12	1.12±0.38	1.18±0.34	0.71
	No (n = 135)	1.33±0.42	1.11±0.35	1.22±0.40
ACE receivers	Yes (n = 79)	1.31±0.27	1.14±0.35	1.25±0.31	0.33
	No (n = 71)	1.36±0.62	1.09±0.36	1.19±0.48
	Mean	1.33±0.41	1.11±0.35	‏-	0.001