Table 3.

Table 3.a. Carbon Monoxide (CO): 2 (Group) x 3 (Time) repeated measures ANCOVAab
GROUP					Overall Model
	N-Acetylcysteine	Placebo	t	p	F (p)
Screening	25.0 (18.4)	26.3 (16.2)	0.1	nsd	3.74 (.043)*
Abst. Day 1	10.0 (6.0)	11.75 (8.4)	0.5	nsd
Abst. Day 2	4.4 (3.4)	13.3 (6.5)	3.4	0.004**
Abst. Day 3c	-	-	-	-
Abst. Day 4 (fMRI visit)	3.5 (1.6)	15.4 (10.5)	3.12	0.007**

Table 3.b. Positive Affect: 2 (Group) x 4 (Time) repeated measures ANOVAab
GROUP					Overall Model
	N-Acetylcysteine	Placebo	t	p	F (p)
Screening	32.8 (6.3)	34.7 (7.7)	0.5	nsd	3.66 (0.036)*
Abst. Day 1	33.5 (6.5)	29.8 (9.2)	0.9	nsd
Abst. Day 2	33.9 (6.6)	28.6 (7.1)	1.5	nsd
Abst. Day 3	33.3 (5.4)	26.9 (6.6)	2.1	0.050*
Abst. Day 4 (fMRI visit)	37.0 (4.9)	25.1 (7.8)	3.6	0.003**

Table 3.c. State craving on fMRI Visit
GROUP
	N-Acetylcysteine	Placebo	t	p
Abst. Day 4 (fMRI visit)	4.3 (1.2)	6.4 (1.2)	3.4	0.004**

Note. Standard deviation reported in parentheses next to mean where applicable.

^aControlling for baseline value during screening (for CO model only) and years of smoking; F-statistic is for Group x Time Interaction

^bGreenhouse-Geisser corrected degrees of freedom

^cTime point excluded due to missing data from 4 subjects

^dp > .05

^*p < .05

^**p < .01

Note. Standard deviation reported in parentheses next to mean where applicable.