Table 2.
Negative Binomial Models for Intervention × DRD4 Effects on Increases in Youth Substance Use
| Male youths
|
Female youths
|
|||||||
|---|---|---|---|---|---|---|---|---|
| Model 1
|
Model 2
|
Model 1
|
Model 2
|
|||||
| Estimate | SE | Estimate | SE | Estimate | SE | Estimate | SE | |
| Constant | −0.688*** | .411 | −1.197** | .460 | −1.453*** | .384 | −1.337** | .392 |
| Substance use, pretest | 1.108*** | .232 | 1.23*** | .233 | 1.582*** | .194 | 1.573*** | .193 |
| DRD4 status | 0.642** | .231 | 1.312*** | .373 | 0.024 | .203 | −0.049 | .269 |
| Intervention status | 0.523 | .363 | −0.188 | .269 | ||||
| Intervention status × DRD4 status | −1.396** | .460 | 0.149 | .411 | ||||
| Socioeconomic risk | −0.089* | .040 | −0.098* | .043 | 0.058 | .038 | 0.060 | .038 |
| Community risk | 0.021* | .011 | 0.027** | .009 | 0.012 | .009 | 0.011 | .009 |
Note: The estimates presented in the table are in log(μ) metric. The standard errors (SE) presented in the table are the robust standard errors.
*
p < .05.
**
p < .01.
***
p < .001.