Table 1.

Interaction ORs (abstinence) and incidence RRs (days of use) with primary outcome of self-reported days of stimulant use within a 30-day window of assessment, Stage-12 high exposure versus low exposure. ^a

Assessment time point (days from baseline)b	Logistic portion of model (abstinence vs. non-abstinence)		Model-based average predicted probabilities of abstinence from stimulant use within each 30-day window
	OR	95% CI for OR	Low Exposure N = 47	High Exposure N = 157	Total N = 204
Mid-treatment (30 days)	41.31	6.55, 260.46	0.43	0.80	0.71
End of treatment (60 days)	20.38	4.07, 102.05	0.49	0.78	0.72
First-follow-up (90 days)	10.05	2.32, 43.54	0.55	0.77	0.72
Last follow-up
91 – 120 days	4.96	1.18, 20.76	0.60	0.76	0.73
121 – 150 days	2.45	0.54, 11.15	0.66	0.75	0.73
151 – 180 days	1.21	0.22, 6.63	0.71	0.74	0.73

Assessment time point (days from baseline)b	Negative binomial portion of model (count of non-zero use)		Model-based average predicted values of number of days of stimulant substance use within each 30-day window
	RR	95% CI for RR	Low Exposure N = 47	High Exposure N = 157	Total N = 204
Mid-treatment (30 days)	0.42	0.22, 0.81	3.09	0.64	1.20
End of treatment (60 days)	0.51	0.28, 0.93	2.99	0.83	1.32
First follow-up (90 days)	0.62	0.36, 1.10	2.86	1.07	1.48
Last follow-up
91 – 120 days	0.76	0.43, 1.34	2.70	1.39	1.69
121– 150 days	0.93	0.51, 1.70	2.50	1.79	1.96
151–180 days	1.14	0.58, 2.22	2.26	2.31	2.30

^aThere was a single covariate, average number of days self-reported stimulant use across three 30-day windows (a 90 day period) prior to baseline.

^bThe Substance Use Calendar timeline follow-back was administered for 30 day windows covering the time from the previously completed assessment.