Table 2.

GEE models of d-amphetamine effects on EEfRT choice behavior (n = 17)

Predictors	beta (b)	SE	p value
Model 1: Behavioral variables only
Reward magnitude	0.62	0.06	<0.001
Probability	0.46	0.08	<0.001
EV	0.57	0.06	<0.001
Trial number	0.00	0.00	0.006
Model 2: Main effect of drug condition
Reward magnitude	0.633	0.06	<0.001
Probability	0.458	0.08	<0.001
EV	0.569	0.06	<0.001
Trial number	−0.003	0.00	<0.001
Drug condition	0.138	0.03	0.004
Model 3: Drug condition × reward magnitude
Reward magnitude	0.752	0.10	<0.001
Probability	0.470	0.08	<0.001
EV	0.533	0.06	<0.001
Trial number	−0.003	0.00	0.005
Drug condition	0.286	0.11	0.011
Drug condition × reward magnitude	−0.056	0.04	0.158
Model 4: Drug condition × probability
Reward magnitude	0.645	0.05	<0.001
Probability	0.665	0.10	<0.001
EV	0.533	0.06	<0.001
Trial number	−0.003	0.00	0.005
Drug condition	−0.042	0.08	0.585
Drug condition × probability	0.091	0.04	0.011
Model 5: Drug condition × EV
Reward magnitude	0.627	0.06	<0.001
Probability	0.440	0.08	<0.001
EV	0.848	0.09	<0.001
Trial number	−0.003	0.00	0.006
Drug condition	0.301	0.05	<0.001
Drug condition × EV	−0.134	0.03	<0.001