Table 2.

Statistical output from linear mixed-effects models of the control preference and of monetary reward maximization, with current vs. recovering users, use severity, polysubstance use, gender, age, & substance used as fixed effects and participant as random effect

Outcome variable	Predictors	df	t	p
Control preference	Current vs. recovering (abstinence)	325	− 4.63	< 0.001
	Severity	325	− 0.40	0.69
	Substance	325	− 2.52	0.01
	Polysubstance use	325	− 0.10	0.92
	Gender	325	0.73	0.47
	Age	325	− 1.23	0.22
	Abstinence x substance	325	3.25	< 0.01
Reward Maximization	Current vs. recovering (abstinence)	321	− 0.46	0.65
	Severity	321	− 1.07	0.28
	Substance	321	− 0.64	0.52
	Polysubstance use	321	− 2.95	< 0.01
	Gender	321	− 0.27	0.79
	Age	321	0.12	0.90
	Abstinence x substance	321	− 0.05	0.96