Table 3.

Statistics of Experiment 2: 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-group comparison
	Test	df	Effect	F	p	Reward	Test	p	Test	p	Test	p
Active	BL, EXT	1,46	reward	1.547	0.219						EtOH
			Test-session	146.81	0.0001	EtOH	BL, EXT	0.0001	BL	0.07	BL	0.0001
			interaction	1.771	0.189	Sac	BL, EXT	0.0001	EXT	0.99	EXT	0.949
	EXT, RE 1 + 2	1,46	reward	5.551	0.023
			Test-session	176.80	0.0001	EtOH	EXT, RE1 + 2	0.0002			RE1 + 2	0.0001
			interaction	6.788	0.012	Sac	EXT, RE1 + 2	0.0001	RE	0.0009
Inactive	BL, EXT	1,46	reward	0.219	0.642						Saccharin
			Test-session	16.127	0.0002	EtOH	BL, EXT	0.006	BL	0.48	BL	0.0001
			interaction	0.336	0.565	Sac	BL, EXT	0.049	EXT	0.95	EXT	0.949
	EXT, RE 1 + 2	1,46	reward	0.394	0.533
			Test-session	7.285	0.009	EtOH	EXT, RE1 + 2	0.195			RE1 + 2	0.0001
			interaction	0.707	0.405	Sac	EXT, RE1 + 2	0.073	RE	0.31

^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.