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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: Pharmacol Biochem Behav. 2014 May 2;122:299–306. doi: 10.1016/j.pbb.2014.04.012

Table 2.

Select demographic characteristics for the IV and IN participant samples.

IV IN
Sex 9M, 4F 11M, 1F
Ethnicity 7 Caucasian
3 Latino
3 Afr-American		 4 Caucasian
3 Afr-American
2 Multiracial
2 Latino
1 Asian
Age ± SEM (yrs) 36.4 ± 1.9 36.5 ± 1.5
Duration of Heroin Use ± SEM (yrs) 11.0 ± 1.2 13.6 ± 1.7
Amount Spent/Day on Heroin ± SEM ($) 67.50 ± 9.1 70.40 ± 7.8