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Table 1 Descriptive statistics: means and standardized differences before and after matching

From: The effects of participation level on recidivism: a study of drug treatment courts using propensity score matching

  Referred Enrolled Completed
Referred & did not enroll (T) vs. not referred (C) Enrolled & did not complete (T) vs. referred & did not enroll (C) Completed (T) vs. enrolled & did not complete (C)
Without matching With matching Without matching With matching Without matching With matching
(Nt= 2,174; Nc= 1,561,225) (Nt= Nc= 1,989) (Nt= 954 Nc= 2,174) (Nt= Nc= 887) (Nt= 747 Nc= 954) (Nt= Nc= 600)
  T (%) C (%) StDif StDif T (%) C (%) StDif StDif T (%) C (%) StDif StDif
Demographics             
Ageŧ 35.6 35.1 4.7 4.3 33.7 35.6 −19.9 0.2 36.8 33.7 32.5 7.1
Female 34.1 32.1 4.1 8.0 35.2 34.1 2.4 −2.1 32.4 35.2 −6.0 −4.2
Black 44.2 36.8 15.1 −1.9 40.7 44.2 −7.1 1.6 43.8 40.7 6.3 4.7
Hispanic 0.8 12.3 −47.6 0.0 0.9 0.8 1.2 −1.1 2.1 0.9 9.7 1.3
Other Race 0.6 3.2 −18.8 5.1 0.6 0.6 −0.2 1.6 0.5 0.6 −1.2 0.0
Index Arrests             
Drug & DWI 0.6 0.2 7.2 −3.9 0.7 0.6 1.7 6.0 1.6 0.7 8.1 −7.3
DWI Felony 0.3 0.0 6.4 0.0 . 0.3 −7.4 −4.7 0.3 0.0 7.3 .
DWI Mis. 8.8 4.4 18.0 0.0 13.2 8.8 14.0 4.0 28.6 13.2 38.6 0.0
Drug Felony 41.0 1.8 108.9 3.2 35.3 41.0 −11.8 −5.1 38.6 35.3 6.7 4.1
Drug Mis. 8.0 3.0 22.3 −5.2 6.6 8.0 −5.4 0.4 5.1 6.6 −6.5 −3.4
Violent Felony 1.4 0.5 8.6 0.4 0.7 1.4 −6.3 2.7 0.5 0.7 −2.5 −4.1
Violent Mis. 2.8 4.1 −7.2 5.4 2.7 2.8 −0.2 0.0 0.7 2.7 −16.0 4.1
Alcohol Felony or Mis. 0.8 1.8 −8.6 −2.1 0.9 0.8 1.2 3.0 0.5 0.9 −4.8 −1.9
Traffic 7.9 72.8 −176.4 1.7 5.6 7.9 −9.2 −4.2 5.0 5.6 −2.7 −2.1
Other Felony 17.8 2.3 53.4 −1.9 21.8 17.8 10.1 0.3 12.4 21.8 −25.0 1.4
Other Mis. 10.6 9.2 4.7 −0.2 12.4 10.6 5.5 3.6 6.7 12.4 −19.4 −1.2
Arrest History             
Drug & DWI 1.0 0.2 10.6 −1.5 1.7 1.0 5.8 2.0 1.5 1.7 −1.6 −3.8
DWI Felony 0.2 0.0 5.4 1.8 . 0.2 −6.1 −6.7 0.1 0.0 5.2 .
DWI Mis. 11.1 3.0 32.2 −5.6 13.4 11.1 7.0 1.3 18.9 13.4 14.9 −3.7
Drug Felony 22.0 2.2 63.9 −1.9 17.4 22.0 −11.5 2.7 10.8 17.4 −18.9 −3.4
Drug Mis. 17.1 3.0 48.3 0.9 17.7 17.1 1.6 −2.3 13.1 17.7 −12.7 −0.5
Violent Felony 1.0 0.5 6.5 2.7 1.3 1.0 2.3 −3.1 . 1.3 −16.0 −16.4
Violent Mis. 6.0 3.1 13.9 3.4 7.7 6.0 6.6 0.9 3.2 7.7 −19.7 3.5
Alcohol Felony or Mis. 2.0 1.1 7.3 3.7 1.7 2.0 −2.6 −0.9 2.3 1.7 4.3 1.2
Traffic 16.2 28.0 −28.7 −0.3 17.3 16.2 2.8 −3.5 22.0 17.3 11.7 0.0
Other Felony 5.1 0.8 25.6 0.9 5.1 5.1 0.1 3.6 3.5 5.1 −8.2 7.1
Other Mis. 3.4 2.3 6.4 −1.6 3.9 3.4 2.5 −2.3 2.8 3.9 −5.9 0.0
None 14.8 55.8 −95.0 2.6 12.9 14.8 −5.6 2.0 21.8 12.9 23.7 6.1
Drug of Choice             
Alcohol 11.4 Data Not Available 19.6 11.4 22.9 38.1 35.1 19.6 35.2 3.5
Cocaine Powder 3.4 8.6 3.4 22.0 0.8 7.6 8.6 −3.5 1.2
Crack 14.7 30.5 14.7 38.5 −1.7 22.0 30.5 −19.5 2.3
Marijuana 7.0 14.4 7.0 24.0 0.7 15.1 14.4 2.2 −0.4
Heroin 5.7 11.0 5.7 19.1 −0.7 6.8 11.0 −14.7 2.4
Other Narcotics 5.0 8.5 5.0 14.1 −2.4 7.9 8.5 −2.2 0.0
“None” or “Other” 1.3 1.8 1.3 3.6 −1.6 1.2 1.8 −4.8 0.0
Missing Value 51.5 5.7 51.5 −117.8 −36.7 4.3 5.7 −6.3 −14.9
Index Yearŧ 2008.3 2008.6 −21.3 1.9 2008.2 2008.3 −10.4 −4.1 2008.2 2008.2 1.5 −4.8
DTC in County 96.2 100.0 −28.0 . 96.4 96.2 1.1 0.0 97.9 96.4 8.5 3.3
  1. Note: Mis. = misdemeanor; T = treatment; C = comparison; StDif = standardized difference.
  2. ŧMean (all other numbers are percent).