Table 2.

Salivary nitric oxide levels (μmol/L) in hemodialysis and control groups.

–	Before Hemodialysis	After Hemodialysis	Control	P value a	P value b	P value c
No.	30	30	30	< 0.001	< 0.001	< 0.001
Mean(μmol/L)	584.31	281.62	44.45
SD	510.7	340.78	26.89
Minimum(μmol/L)	33.30	31.40	10.60
Maximum(μmol/L)	1407	1321	128.30
First quartile	135.60	41.70	28.50
Median	419.50	114.50	38.20
Third quartile	1066	432.10	42.5

^a Comparison between control and pre-hemodialysis (Mann-Whitney U test) ^b Comparison between control and post-hemodialysis (Mann-Whitney U test) ^c Comparison between pre- and post-hemodialysis