Table 2.

Within Group Changes of YBOCS Score in the Two Groups during This Study

	Group	Mean(SD)	Significance
Difference between baseline and week 4	NAC	4.3(4.8)	0.001
	Placebo	2.6(9.7)	0.3
Difference between baseline and week 8	NAC	8.0(5.9)	0.003
	Placebo	4.0(97.9)	0.3
Difference between baseline and week 10	NAC	9.6(6.6)	0.001
	Placebo	2.8(9.7)	0.3

Wilcoxon Signed Ranks Tests were performed.