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Table 5 Predictors of treatment intensity (number of visits per episode) 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 Number
Lower Upper of Visits per Episode
Intercept 1.84 0.16 <.0001 . . . .
Age 0.02 0.00 <.0001 1.02 1.02 1.02 Age 25 = 11.8
        Age 40 = 14.8
Education:
 Less than high school −0.16 0.03 <.0001 0.85 0.80 0.90 11.8
 High school or more (ref) . . 1.00 . . 13.8
Receiving social assistance:        
 Yes 0.11 0.04 0.002 1.12 1.03 1.21 13.5
 No (ref) . . 1.00 . . 12.1
Marital status:
 Not married 0.08 0.03 0.03 1.08 1.02 1.15 13.3
 Married or partnered (ref) . . 1.00 . . 12.3
Stimulant problems c:
 Yes 0.21 0.03 <.0001 1.23 1.16 1.31 14.2
 No (ref) . . 1.00 . . 11.5
Maximum frequency of substance use, past 30 days:
 Binge use 0.24 0.10 0.01 1.27 1.04 1.55 15.0
 3 times per week to daily 0.09 0.04 0.02 1.09 1.01 1.18 13.0
 Up to 2 times per week −0.03 0.05 0.60 0.98 0.88 1.07 11.6
 No use (ref) . . 1.00 . . 11.8
Treatment mandate:
 Legal system −0.19 0.08 0.02 0.83 0.71 0.97 10.7
 Child protection services 0.04 0.04 0.25 1.04 0.96 1.13 13.5
 Employer or school 0.10 0.10 0.34 1.11 0.91 1.34 14.3
 None (ref) . . 1.00 . . 13.0
Pregnant at admission:
 Yes 0.19 0.04 <.0001 1.21 1.12 1.31 14.1
 No, possibly, unknown (ref) . . 1.00 . . 11.6
  1. aNegative binomial regression with random effect for agency; includes one episode per client (first episode selected). N = 4724. Excludes 438 clients (8.5% of 5162) with missing values on predictor variables. AIC = 33,837.2 BIC = 33,858.2
  2. bCoefficients were not statistically significant for: employment status, alcohol problem, cannabis problem, opioid problem, legal system involvement, injection drug use
  3. cIncludes powder cocaine, crack, other amphetamines including methamphetamine