Table 2.
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.