TABLE 5.

Effects of Network Properties on Injection Drug Use at 3 Months, United States and Australia

	Model 1			Model 2
Variable	Beta	Odds Ratio	95% Confidence Interval	Beta	Odds Ratio	95% Confidence Interval
Background characteristics
Age (years)	−0.03	0.97	0.66, 1.43	0.06	1.06	0.74, 1.53
Gender (male = 1)	−1.25	0.29	0.06, 1.42	−1.03	0.36	0.09, 1.14
Site (United States = 1)	−0.59	0.55	0.14, 2.15	−0.45	0.64	0.18, 2.30
Baseline behavior (user =1)
Injection drug user	2.64**	14.04	2.86, 68.99	2.68**	14.65	2.94, 73.00
Network properties
Concentration of injecting friends	0.96*	2.62	0.91, 7.52
Change in concentration				0.66	1.93	0.88, 4.22
Concentration of homeless friends	−0.25	0.78	0.23, 2.57
Change in concentration				0.69*	2.00	0.94, 4.26
Density	−0.07	0.93	0.29, 2.98
Hosmer-Lemeshow test
Chi-square	7.23			7.47
df	8			8
p > chi-square	0.51			0.49
−2 log likelihood	92.98			97.88

^*p < .05.

^**p < .01. One-tailed t test.