. Author manuscript; available in PMC: 2019 Jan 1.

Published in final edited form as: J Psychoactive Drugs. 2017 Sep 29;50(1):62–71. doi: 10.1080/02791072.2017.1370747

Table 3.

Transition probabilities from baseline (rows) to 6 month follow up (columns) for the four status model overall and by perceived treatment need

(a) Overall Transition Probabilities (N=735)

	Heroin Injection (38%)	Co-Injection (15%)	Heroin & Meth Injection (32%)	Polydrug & Polyroute (14%)
Heroin Injection (38%)	.71	.09	.13	.07
Co-Injection (3%)	.00	.48	.35	.18
Heroin & Meth Injection (37%)	.18	.21	.60	.02
Polydrug & Polyroute (22%)	.23	.13	.18	.47

(b) Probabilities of transitioning between statuses if reported great or urgent need for help c (N = 375)

	Heroin Injection (38%)	Co-Injection (15%)	Heroin & Meth Injection (32%)	Polydrug & Polyroute (14%)
Heroin Injection (38%)	.66	.13	.08	.13
Co-Injection (3%)	.00	.53	.00	.47
Heroin & Meth Injection (37%)	.21	.08	.53	.18
Polydrug & Polyroute (22%)	.18	.24	.01	.58

(c) Probabilities of transitioning between statuses if reported none or some need for help (N = 360)

	Heroin Injection (38%)	Co-Injection (15%)	Heroin & Meth Injection (32%)	Polydrug & Polyroute (14%)
Heroin Injection (38%)	.77	.07	.04	.12
Co-Injection (3%)	.00	.46	.31	.24
Heroin & Meth Injection (37%)	.24	.19	.40	.18
Polydrug & Polyroute (22%)	.13	.17	.03	.67

(d) Odds ratios of transitioning for those reporting great or urgent need for help vs. none or some need for help (N = 735)

	Heroin Injection (38%)	Co-Injection (15%)	Heroin & Meth Injection (32%)	Polydrug & Polyroute (14%)
Heroin Injection (38%)	1.00	2.11	2.49	1.31
Co-Injection (3%)	(--)	1.00	.00	1.67
Heroin & Meth Injection (37%)	.68	.31	1.00	.72
Polydrug & Polyroute (22%)	1.60	1.63	.41	1.00