Table 2.

Alcohol self-administration by drinking type

	Reward (n = 48)	Relief + habit (n = 19)	Statistic	P	Effect size (Cohen’s d)
Number of drinks	11.25 ± 4.84	9.84 ± 5.21	t = 1.05	0.30	0.28
Maximum BrAC	97.70 ± 21.09	91.79 ± 22.22	t = 1.02	0.31	0.27
Number of button presses (log transformed)	3.10 ± 0.82	2.92 ± 0.86	t = 0.79	0.63	0.21
Breakpoint (log transformed)	2.58 ± 0.56	2.42 ± 0.60	t = 1.00	0.66	0.28