. Author manuscript; available in PMC: 2010 Jul 13.

Published in final edited form as: Int J Drug Policy. 2008 Oct 31;20(4):304–308. doi: 10.1016/j.drugpo.2008.09.004

Table 2.

Univariate analysis of retention rates for continuous variables.

	Mean	S.D.	HR	p-Value^*
Dosage	38.0	16.6	0.986	<0.0001
Years of education	9.4	2.8	0.954	0.0091
Age	33.3	6.1	0.992	0.3178
Years of drug use	8.0	4.0	0.979	0.1005

Statistical significant probability values in bold.

p-values were calculated by univariate Cox model.