Table 6.

Model-Free Measures of Task Behavior by Group (Means and Standard Deviations)

Full Sample	HCs	SUDs	p	Cohen’s d
N=	54	147
Wins	183.59 (12.08)	179.33 (13.01)	0.03	0.33
Reaction Time	0.62 (0.25)	0.57 (0.26)	0.29
Win/Stay	136.54 (32.46)	130.20 (36.44)	0.26
Win/Shift	35.41 (28.04)	37.48 (29.51)	0.70
Lose/Stay	42.17 (26.54)	45.89 (30.22)	0.43
Lose/Shift	85.89 (28.01)	86.43 (32.10)	0.91
Propensity Matched	HCs	SUDs	p	Cohen’s d
N=	51	49
Wins	183.25 (12.34)	178.16 (13.60)	0.05	0.39
Reaction Time	0.62 (0.25)	0.54 (0.27)	0.15
Win/Stay	136.24 (32.75)	131.10 (38.92)	0.48
Win/Shift	35.47 (28.00)	35.63 (32.46)	0.98
Lose/Stay	41.43 (27.00)	52.45 (33.87)	0.08*
Lose/Shift	86.86 (28.47)	80.82 (34.30)	0.34

^*When only examining early trials in each game (i.e., first 7 choices), this difference was significant at p = 0.03.