TABLE 4.

Negative Binomial Regression of Residential Instability: 9 Months (Exp(β))

Baseline	Model 1	Model 2	Model 3
Need indicators
Days in last 30 experienced alcohol problems	1.03	1.03	1.15*
Days in last 30 experienced drug problems	0.98	1.01	1.09**
Days in last 30 experienced psychological problems	0.97*	0.96*	0.86***
Any chronic medical problems interfere with life	1.78	4.09***	3.61***
Controls
Age	0.97	0.65	1.03
Race (Black)	0.21***	0.15***	0.16***
Sex (Male)	0.56	0.88	1.09
Service preference (0=not at all; 4=extremely important)
Importance of treatment for alcohol problems	0.91	0.77*	0.71**
Importance of treatment for drug problems	1.05	0.94	0.88
Importance of treatment for psychological problems	0.96	0.94	1.15
Prefer less staff help	0.56**	0.69	0.72
Reject case manager-identified need for staff help	5.98***	4.52**	4.92**
Test of peer effect
Substance abuse service use 3 mo prebaseline		1.11***	1.14***
Mental health service use 3 mo prebaseline		1.08	1.00
Days not housed in 1 mo prebaseline		1.02	1.03
Randomized to peer specialist		0.83	0.40
Peer×baseline alcohol problems			0.93
Peer×baseline drug problems			0.81***
Peer×baseline psych problems			1.17***
Akaike Information Criterion (AIC)	452.44	424.83	392.56
Finite Sample Corrected AIC	456.12	431.27	401.69
Bayesian Information Criterion	487.90	471.20	447.11
N †	113	113	113

^†4 extreme outliers excluded (x>60)

^*P≤0.05.

^**P≤0.01.

^***P≤0.001.