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. Author manuscript; available in PMC: 2012 May 1.

Published in final edited form as: Drug Alcohol Depend. 2010 Dec 3;115(1-2):107–112. doi: 10.1016/j.drugalcdep.2010.11.003

Table 3.

Nested Negative Binomial Models Examining Factors Independently Associated with Number of Non-fatal Overdose and Number of Witnessed Overdoses

	Non-Fatal ODs		Witnessed ODs
	Adjusted Incidence Rate Ratio	95% CI	Adjusted Incidence Rate Ratio	95% CI
Block 1 - Individual Factors
Ever in Drug Treatment	1.58	1.00 – 2.51
Recent Injection Rx Opioids	1.58	1.01 – 2.49
Post Traumatic Stress Disorder	2.71	1.52 – 4.86	1.79	1.10 – 2.91
Antisocial Personality Disorder	1.69	1.06 – 2.69
Recent Methamphetamine Use			6.09	2.29 – 16.2
Age			1.02	1.00 – 1.05
Block 1 Model Statistics	X²=34.5^***		X²=24.6^***
	Pseudo R²=0.044		Pseudo R²=0.050

Block 2 - Network Factors
# Support Network Members	1.19	1.01 – 1.40	1.23	1.06 – 1.44
Outdegree Centrality			1.34	1.16 – 1.56
Block 2 Model Statistics	X²=4.40^*		X²=25.9^***
	Pseudo R²=0.018		Pseudo R²=0.036

^*

p<0.05

^**

p<0.01

^***

p<0.001