Table 1.

Statistics of two-reward operant experiment: results for repeated-measures ANOVA and Newman–Keuls post hoc test^a

Lever	Repeated-measures ANOVA					Newman–Keuls post hoc test					t test (comparison active/inactive)
						Within-group comparison			Between reward comparison
	Test	df	Effect	F	p	Reward	Test	p	Test	p	Test	p
Active	BL, EXT	1,24	reward	0.136	0.716						EtOH
			Test-session	53.099	0.0001	EtOH	BL, EXT	0.0002	BL	0.559	BL	0.0002
			interaction	0.214	0.648	Sac	BL, EXT	0.0002	EXT	0.939	EXT	0.273
	EXT, RE	1,24	reward	4.194	0.052
			Test-session	61.623	0.0001	EtOH	EXT, RE	0.0001			RE	0.0001
			interaction	3.851	0.061	Sac	EXT, RE	0.001	RE	0.007
Inactive	BL, EXT	1,24	reward	3.242	0.084						Saccharin
			Test-session	51.616	0.0001	EtOH	BL, EXT	0.0001	BL	0.01	BL	0.0012
			interaction	3.873	0.06	Sac	BL, EXT	0.001	EXT	0.72	EXT	0.273
	EXT, RE	1,24	reward	1.544	0.225
			Test-session	43.587	0.0001	EtOH	EXT, RE	0.002			RE	0.0012
			interaction	1.419	0.245	Sac	EXT, RE	0.0001	RE	0.1

^aComparison between active and inactive lever was done using two-tailed paired t test. BL, Self-administration baseline; EXT, extinction; RE, cue-induced reinstatement; EtOH, ethanol; Sac, saccharin.