Table 1.

Frequencies and Means of Covariates.

	Full Sample (N=3,473)		3-Month Follow-Up (N=908)					6-Month Follow-Up (N=2,512)
			Non-Missing		Missing			Non-Missing		Missing
	n	%	n	%	n	%	p	n	%	n	%	p
Study							<.001					<.001
F-PAD	473	13.6	0	0.0	473	18.4		381	15.2	92	9.6
MacRisk	1,136	32.7	845	93.1	291	11.3		855	34.0	281	29.2
SCAP	404	11.6	0	0.0	404	15.8		339	13.5	65	6.7
CATIE	1,460	42.0	63	6.9	1,397	54.5		936	37.3	525	54.5
Baseline Alcohol Use							<.001					<.001
Abstinence	2,474	55.3	270	29.8	2,204	61.8		1,286	51.3	1,188	60.4
Non-problematic use	858	19.2	254	28.0	604	16.9		534	21.3	324	16.5
Problematic use	1,141	25.5	382	42.2	759	21.3		686	27.4	455	23.1
Baseline Drug Use							<.001					<.001
Abstinence	3,022	67.7	470	51.9	2,552	71.7		1,629	65.1	1,393	70.9
Non-problematic use	476	10.7	143	15.8	333	9.4		301	12.0	175	8.9
Problematic use	969	21.7	293	32.3	676	19.0		572	22.9	397	20.2
Baseline Suicidal Ideation							<.001					.006
No	2,913	65.2	301	33.2	2,612	73.4		1,588	63.5	1,325	67.5
Yes	1,552	34.8	606	66.8	946	26.6		913	36.5	639	32.5
Baseline Suicide Attempt							<.001					<.001
No	3,928	88.0	588	64.9	3,340	93.9		2,145	85.8	1,783	90.8
Yes	536	12.0	318	35.1	218	6.1		355	14.2	181	9.2
Baseline Symptoms (M±SD)
Affective	.26±.89		.59±.99		.18±.84		<.001	.30±.90		.21±.88		<.001
Positive	.09±.93		−.11±1.05		.15±.89		<.001	.19±.94		−.03±.91		<.001
Negative	−.07±.92		−.32±.88		−.01±.92		<.001	.04±95		−.22±.87		<.001
DCP	−.02±.88		−.36±.77		.07±.89		<.001	.09±.91		−.15±.83		<.001

Notes. %=valid percent. Means of variables were compared across missing and non-missing participants by t tests, and proportions were compared by chi square tests.