Levels and predictors of participation in integrated treatment programs for pregnant and parenting women with problematic substance use

Table 4 Predictors of treatment retention (number of days between the first and last visit) ^a

Variable^b	Est.	S.E.	p	Incidence Rate Ratio	95% Confidence Interval		Predicted Retention Time
Variable^b	Est.	S.E.	p	Incidence Rate Ratio	Lower	Lower	Predicted Retention Time
Intercept	4.44	0.16	<.0001	.	.	.	.
Age	0.01	0.00	0.04	1.00	1.01	1.01	Age 25 = 107.3
							Age 40 = 118.4
Education:
Less than high school	−0.10	0.04	0.02	0.90	0.84	0.98	109.1
High school or more	(ref)	.	.	1.00	.	.	120.1
Stimulant problems^c:
Yes	0.23	0.04	<.0001	1.26	1.16	1.36	128.2
No	(ref)	.	.	1.00	.	.	102.2
Pregnant at admission:
Yes	0.11	0.05	0.03	1.12	1.01	1.23	120.8
No, possibly, unknown	(ref)	.	.	1.00	.	.	108.4

^aNegative binomial regression with random effect for agency; includes one episode per client (first episode selected). N = 5002. Excludes 160 clients (3.1% of 5162) with missing values on predictor variables. AIC = 55,673.0, BIC = 55,682.8
^bCoefficients were not statistically significant for: receiving social assistance, employment status, marital status, alcohol problem, cannabis problem, opioid problem, frequency of substance use, legal system involvement, treatment mandate, pregnant at admission
^cIncludes powder cocaine, crack, other amphetamines including methamphetamine

ISSN: 1471-2458