Table 5.

Model Parameters by Group (Means and Standard Deviations)

Full Sample	HCs	SUDs	p*	Cohen’s d
N=	54	147
Action Precision	2.59 (0.88)	2.18 (0.58)	0.004	0.43
Reward Sensitivity	4.43 (1.44)	4.26 (1.42)	0.85
Learning rate (Wins)	0.48 (0.12)	0.50 (0.13)	0.04	0.31
Learning rate (Losses)	0.42 (0.13)	0.38 (0.15)	0.02	0.36
Insensitivity to Information	0.76 (0.29)	0.81 (0.30)	0.27
Propensity Matched	HCs	SUDs	p	Cohen’s d
N=	51	49
Action Precision	2.60 (0.9)	2.17 (0.59)	0.005	0.57
Reward Sensitivity	4.38 (1.45)	4.37 (1.56)	0.98
Learning rate (Wins)	0.47 (0.12)	0.53 (0.12)	0.02	0.46
Learning rate (Losses)	0.41 (0.13)	0.34 (0.16)	0.01	0.52
Insensitivity to Information	0.77 (0.28)	0.84 (0.30)	0.26

^*within a linear model including Age, Sex, and WRAT scores