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. Author manuscript; available in PMC: 2012 Dec 3.
Published in final edited form as: Health Econ. 2008 Aug;17(8):927–946. doi: 10.1002/hec.1305

Table AI.

Results for the fixed-effects negative binomial regression

Random-effect
specification
coefficient (Z-ratio)
Fixed-effect
specification
coefficient (Z-ratio)
Indicator for post-intervention −1.04***
(5.53)
−1.11***
(5.69)
Modality main-effects
Short-term hospital-based inpatient modality 0.31
(1.14)
1.61+
(1.65)
Short-term residential SAT modality 0.12
(0.77)
1.22+
(1.71)
Long-term residential SAT modality 0.43***
(3.19)
0.66
(1.22)
Ambulatory methadone SAT 0.35
(1.31)
−0.61
(0.45)
Ambulatory non-methadone SAT (referent)
Interaction terms
Short-term hospital-based
inpatient modality*post
0.12
(0.26)
0.025
(0.05)
Short-term residential SAT
modality*post
0.54+
(1.71)
0.70*
(2.07)
Long-term residential SAT
modality*post
0.59*
(2.28)
0.61*
(2.27)
Ambulatory methadone
SAT*post
0.59
(1.12)
0.58
(1.08)
Ambulatory non-methadone SAT (Referent)* post
Homeless 0.75***
(7.47)
0.97*
(2.19)
Criminal justice client 0.09
(0.87)
−0.17
(0.35)
Government paid for treatment 0.27**
(2.58)
−0.49
(1.10)
Convicted of a prior crime 0.49***
(4.30)
−0.42
(0.89)
Uninsured 0.06
(0.57)
0.0
(0.01)
Involved in sex work 1.01***
(7.65)
0.25
(0.47)
Cocaine as primary drug of abuse 0.30+
(1.78)
0.46
(0.51)
Cocaine as secondary drug of abuse 0.42**
(2.96)
−0.48
(0.73)
Heroin as primary drug of abuse 0.27
(1.34)
1.54
(1.46)
Heroin as secondary drug of abuse −0.18
(0.65)
−14.0
(0.02)
Alcohol as primary drug of abuse −0.29+
(1.65)
1.58+
(1.75)
Alcohol as secondary drug of abuse 0.04
(0.35)
0.12
(0.23)
Marijuana as primary drug of abuse −0.26
(1.37)
1.43
(1.44)
Marijuana as secondary drug of abuse −0.05
(0.37)
0.26
(0.41)
Age −0.08***
(12.17)
0.0045
(0.12)
Age squared 0.003***
(4.93)
−0.0025
(0.62)
Male 0.95***
(7.26)
−0.24
(0.42)
Black 0.18
(1.56)
0.037
(0.07)
Hispanic/Latino 0.24+
(1.80)
0.06
(0.09)
High school graduate −0.13
(1.30)
0.048
(0.10)
Completed 9th grade 0.13
(0.86)
0.28
(0.33)
Employed −0.49**
(2.76)
0.19
(0.22)
***

p < 0.001,

**

p < 0.01,

*

p < 0.05,

+

p < 0.10.