TABLE 1.

Descriptive Statistics of Analysis Variables Before and After Imputation

Variable	N	Data Before Imputation				Imputed Data (N = 871)
		Mean	SD	Min.	Max.	Mean	SD	Min.	Max.
Dependent Variables
Meth UA Negative, One-Year Follow-up	670	0.71	–	0	1	0.69	–	0	1
Meth UA Negative, Three-Year Follow-up	480	0.74	–	0	1	0.71	–	0	1
Independent Variables			–					–
Performance
Engagement	871	0.32	–	0	1	0.32	–	0	1
Three Consecutive Negative Urines During Treatment	871	0.42	–	0	1	0.42	–	0	1
Proportion of Expected Length of Treatment R Retained	744	0.65	0.34	0	1.08	0.61	0.34	0	1.08
Demographics
Age	871	32.9	7.93	18.1	56.5	32.9	7.93	18.1	56.5
Femalea	871	1.57	–	1	2	1.57	–	1	2
White (vs. Other)	871	0.63	–	0	1	0.63	–	0	1
Living Arrangement at Baseline (Vs. with Partner)			–				–
No Partner, Alone or with Children	869	0.15	–	0	1	0.15	–	0	1
With Others	869	0.42	–	0	1	0.42	–	0	1
In Controlled Environment	869	0.04	–	0	1	0.04	–	0	1
In an Unstable Situation	869	0.06	–	0	1	0.06	–	0	1
Lived with AOD User at Baseline	871	0.31	–	0	1	0.31	–	0	1
Usual Baseline Employment Status (vs. not Working)			–				–
Full-time	870	0.49	–	0	1	0.49	–	0	1
Part-time	870	0.12	–	0	1	0.12	–	0	1
Substance Abuse History
# AOD Treatments between Baseline and One-Year Follow-up	766	0.50	0.84	0	6	0.52	0.82	0	6
# AOD Treatments between Baseline and 3-Year Follow-up	786	1.23	2.13	0	31	1.91	2.30	0	31
# Days in Past 30 used Meth at Baseline	871	11.85	9.70	0	30	11.85	9.70	0	30

Note: SD = standard deviation, Min. = minimum, Max. = maximum. Standard deviations for dichotomous variables are not presented.

^aMale = 1, female = 2. Mean indicates that 57% of the sample is female.