Table 3.

Effects of study cigarette conditions on withdrawal symptoms following overnight abstinence after the 6-week use period.

	0.4 mg/g	0.4 mg/g HT	1.3 mg/g	2.4 mg/g	5.2 mg/g	Usual brand
Angry/irritable/frustrated	−.64 (.29)*	.09 (.27)	−.38 (.27)	−.20 (.28)	−.35 (.27)	.67 (.27)*
Anxious/nervous	−.54 (.30)†	.20 (.28)	−.41 (.28)	.19 (.28)	.04 (.28)	.76 (.27)**
Depressed mood/sad	−.47 (.36)	.02 (.32)	−.32 (.33)	−.26 (.33)	−.18 (.33)	.04 (.32)
Desire or craving to smoke	−.48 (.27)†	−.08 (.27)	−.65 (.27)*	−.24 (.27)	−.32 (.27)	.58 (.28)*
Difficulty concentrating	−.70 (.30)*	.11 (.28)	−.38 (.28)	−.20 (.28)	−.41 (.28)	.33 (.27)
↑appetite/hungry/weight gain	−.23 (.29)	.16 (.29)	.18 (.27)	−.19 (.28)	−.40 (.29)	.05 (.27)
Insomnia/sleep problems/awakening at night	−.09 (.31)	.16 (.30)	−.07 (.31)	.12 (.30)	−.14 (.31)	.60 (.32)†
Restless	−.32 (.29)	−.01 (.28)	−.24 (.28)	−.28 (.28)	−.23 (.28)	.56 (.28)*

Unstandardized coefficients (standard errors) are reported for the effect of each group relative to the NNC control. Significant and positive effects indicate that the group of interest reported increased withdrawal relative to the NNC control during the abstinence period.

^***p < .001,

^**p < .01,

^*p < .05,

^†p < .10; Significant coefficients are bolded using a significance level of .05.