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. 2014 May 22;9(1):8. doi: 10.1186/1940-0640-9-8

Table 2.

Outcomes of Life Shift/Shift Gears using complete cases (n=292) and imputed cases (n = 694)

Means (SE) or percent
Outcome
Life Shift intervention
Shift Gears control
p value for group ×; time interaction or Wald χ 2
  Baseline Follow-up Baseline Follow-up  
Past 30 day drug abstinence at follow-up (%)b
 Self-reported
 
12.5 (3.2)
 
12.0 (3.1)
.888
 Biologically validatedc
 
7.0 (2.5)
 
2.0 (1.2)
.074
Self-reported drug use – ASI Composite Score (0-1)
 Complete cases
.059 (.008)
.068 (.010)
.055 (.007)
.095 (.010)
.035a
 Imputed
.070 (.005)
.075 (.006)
.068 (.006)
.085 (.007)
.124a
Medical problems – ASI Composite Score (0-1)
 Complete cases
.639 (.021)
.176 (.038)
.696 (.020)
.280 (.036)
.404a
 Imputed
.65 (.013)
.219 (.023)
.669 (.014)
.248 (.024)
.627a
Psychiatric problems – ASI Composite Score (0-1)
 Complete cases
.287 (.031)
.250 (.029)
.292 (0.27)
.243 (.025)
.734a
 Imputed
.264 (.017)
.239 (.016)
.272 (.017)
.228 (.017)
.404a
Alcohol use – ASI Composite Score (0-1)
 Complete cases
.127 (.018)
.124 (.016)
.106 (.017)
.106 (.015)
.888
 Imputed
.126 (.011)
.115 (.009)
.126 (.012)
.112 (.010)
.808
Past 6 mo. health care utilization
 No. of ED visitsd
.528 (.106)
.828 (.129)
.549 (.111)
.806 (.135)
.826a
 No. of hospitaliz.e
.196 (.094)
.261 (.111)
.146 (.099)
.317 (.117)
.479
 No. of days hosp.e
1.26 (.607)
1.60 (643)
1.43 (.643)
2.56 (.681)
.335a
Driving and traffic risk scores
 Complete cases
.975 (.068)
.831 (.070)
.840 (.064)
.907 (.066)
.057
 Imputed 1.00 (.045) .935 (.042) .837 (.048) .897 (.045) .165

aSignificant time main effect, p < .05.

bImputation not available for dichotomous outcomes, therefore, analyses based on 292 complete cases.

cThose followed and reporting 0 drug use but who did not provide a hair sample for any reason; assumed to be nonabstinent.

dData available for 602 patients.

eSite 2 only; data available for 97 patients.