TABLE 3.

Negative Binomial Regression of VA Mental Health Services: Baseline to 9 Months (Exp(β))

Baseline	Model 1	Model 2	Model 3
Need indicators
Days in last 30 experienced alcohol problems	1.01	1.01	0.98
Days in last 30 experienced drug problems	1.00	1.00	1.01
Days in last 30 experienced psychological problems	1.02*	1.01	1.00
Any chronic medical problems interfere with life	1.55*	1.62*	1.67*
Controls
Age	1.01	1.02	1.00
Race (White)	2.37***	2.48***	1.96***
Sex (male)	0.54	0.51*	0.34**
Service preference (0=not at all; 4=extremely important)
Importance of treatment for psychological problems		1.25***	1.18*
Test of peer effect
Mental health service use 3 mo prebaseline			1.19***
Randomized to peer specialist			1.48*
Akaike Information Criterion (AIC)	832.09	823.55	785.65
Finite Sample Corrected AIC	833.16	824.89	787.65
Bayesian Information Criterion	855.85	850.28	818.32
N †	144	144	144

^†1 extreme outlier excluded (x>60).

^*P≤0.05.

^**P≤0.01.

^***P≤0.001.