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

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

Variableb Est. S.E. p Incidence Rate Ratio 95% Confidence Interval Predicted Retention Time
Lower Lower
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 problemsc:
 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
  1. 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
  2. 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
  3. cIncludes powder cocaine, crack, other amphetamines including methamphetamine