Trends in drop out, drug free discharge and rates of re-presentation: a retrospective cohort study of drug treatment clients in the North West of England

Table 3 Factors predicting re-presentation to treatment for those who dropped out and were discharged drug free in the previous year

Factors predicting re-presentation as treatment (N = 4291)
Variable	Adjusted odds ratio (95% confidence interval)	P value
Age group		0.031
10 to 19		Ref
20 to 29	1.87 (1.27, 2.75)	0.002
30 to 39	1.73 (1.17, 2.55)	0.006
40 to 49	1.50 (0.95, 2.38)	0.081
50 to 59	1.38 (0.71, 2.71)	0.345
60 to 69	1.72 (0.15, 20.36)	0.667
Year		< 0.001
1998		Ref
1999	1.17 (0.96, 1.42)	0.117
2000/01*	1.28 (1.04, 1.56)	0.017
2001/02	2.60 (2.14, 3.15)	< 0.001
Treatment history
New to treatment		Ref
Prior treatment contact	2.50 (2.18, 2.86)	< 0.001

*Reporting changed from UK calendar to financial year to adhere to new national requirements.
Ref is the reference category.
Other variables entered into the analysis which were not significant were sex (P = 0.395) and outcome (drop out versus discharged drug free) (P = 0.522).
Hosmer and Lemeshow Goodness-of-Fit Test: X ² = 7.273, P = 0.508.

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