Table. 2.

Results of the substance use as outcomes models in the EMA sample.

a. Prediction of substance use at time t+1, by precedent use and Stroop time (individual or group-centered) levels
			Outcome at time t + 1: use of
	Primary substance					Any substance
Predictors at time t	γ	SE		Z value	p value	γ	SE	Z value	p value
Any substance use	0.5612	0.2071		2.709	<0.01A	0.6775	0.20050	3.379	<0.001A
Primary substance use	0.7650	0.1725		4.434	<0.001A	0.2525	0.21050	1.200	0.23
Craving	0.3632	0.0763		4.763	<0.001A	0.3897	0.0902	4.319	<0.001A
Stroop time (individual-centered)	−0.1189	0.1346		−0.883	0.38	−0.3295	0.1549	−2.127	0.03C
Stroop time (group-centered)	0.3558	0.1813		1.963	0.049B	0.2768	0.284203	0.974	0.33
Stroop × craving	0.0715	0.1349		−0.530	0.60	−0.1501	0.1852	−0.810	0.42
Stroop × time	0.0306	0.0164		1.867	0.06	0.0046	0.017933	0.251	0.80

b. Prediction of Stroop time (individual or group-centered) by precedent substance use
	Predictors at time t: use of
	Primary substance				Any substance
Outcome at time t + 1	γ	SE	Z value	p value	γ	SE	Z value	p value
Stroop time (individual-centered)	0.3601	0.1316	2.737	<0.01A	0.2267	0.1486	1.526	0.13
Stroop time (group-centered)	0.7625	0.2198	3.470	<0.001A	0.7546	0.3317	2.275	0.02

c. Prediction of primary substance use at time t+1 by use of primary substance at time t while entering Stroop time at time t as mediator
	Outcome at time t + 1: use of primary substance
Effect type by predictors at time t	Estimate	Lower CI	Upper CI	p value
Average causal mediation effects by Stroop time (group-centered)	0.0167	0.0023	0.04	<0.02
Average direct effects of substance use	0.2131	0.1105	0.31	<0.001
Total effect	0.2298	0.1300	0.32	<0.001
Proportion mediated by Stroop time (group-centered)	0.0624	0.0094	0.19	0.02

^ASurviving correction for age, sex, education, addiction severity, and primary substance type.

^BSurviving correction for previous use at time t, craving at time t, sex, education, addiction severity, and primary substance type but not for age.

^CSurviving correction for previous use at time t, age, sex, education, addiction severity, and primary substance type but not for craving at time t.

CI confidence interval at 95%.