Table 1.

Semantic Verbal Fluency (SVF), Phonemic Verbal Fluency (PVF), Withdrawal and QSU scores at pre-abstinence and post-abstinence, and the difference between the two lab sessions.

		Pre-abstinence (Lab 1)	Post-abstinence (Lab 2)	p-value
SVF (animals)
Score		20.07 (5.60)	21.83 (6.53)	0.012
Errors		0.10 (0.31)	0.13 (0.43)	ns*
Repetitions		0.67 (1.10)	0.77 (1.10)	ns
PVF (letter F)
Score		13.16 (3.65)	14.03 (5.51)	ns
Errors		0.66 (0.88)	0.50 (0.86)	ns
Repetitions		1.10 (1.52)	0.96 (1.13)	ns
Withdrawal		5.13 (6.00)	7.46 (7.54)	0.007
QSU Score		34.63 (15.29)	48.47 (11.31)	< 0.001
Exhaled CO concentration (ppm)#		14.47 (6.71)	4.43 (1.43)	< 0.001

^*p-values > 0.1 reported as ns (not significant)

^#CO concentrations were measured in parts per million (ppm)