. 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 3.

Hazard ratios and retention rates at different cut points.

Dosage cut points (ml)	Hazard ratio	95% Confidence interval		p-Value^*	14-month retention rates (%)
Dosage cut points (ml)	Hazard ratio			p-Value^*	<cut point	≥cut point
0	0.852	0.679	1.068	0.1642	52.2	63.5
45	0.796	0.622	1.019	0.0705	53.2	64.7
50	0.709	0.535	0.945	0.0167	53.6	66.6
55	0.681	0.488	0.950	0.0236	54.6	66.5
60	0.632	0.419	0.952	0.0284	54.7	70.7
65	0.505	0.300	0.845	0.0098	54.7	76.4

Statistical significant probability values in bold.

p-values are from multivariate Cox model controlling for clinics, marital status, education, religion, years of heroin use, being a local resident, previous detoxification programmes, clinic locations, and clients’ treatment expectations.