Table 2. Multilevel models with prenatal smoking predicting heart rate during object manipulation.
| Variables | Model 1 | Model 2 | Model 3 | Model 4 |
|---|---|---|---|---|
| Effects on Intercept | ||||
| Intercept | 129.908*** | 129.907*** | 129.908*** | 129.736*** |
| Maternal Age | .003 | .003 | .005 | .033 |
| Prenatal Smoking | -.009 | .033 | .001 | .065 |
| Prenatal Marijuana | .075 | .075 | .055 | .123 |
| Prenatal Alcohol | .346 | .339 | .317 | .998 |
| FA Duration | -.083*** | -.083*** | -.083*** | -.083*** |
| Activity Level | .698** | .697*** | .715** | .713** |
| Effects on Slope | ||||
| Time | .034*** | .034*** | .034*** | .032*** |
| Prenatal Smoking X Seconds | .002*** | .002*** | ||
| Activity Level X Seconds | .011** | .010** | ||
| BIC | 439944.8 | 439936.5 | 439935.1 | 439928.1 |
| Variance in Intercept | 87.663*** | 87.621*** | 87.608*** | 87.587*** |
| Variance between Trials | 8.269*** | 8.261*** | 8.257*** | 8.250*** |
| Variance in Slope | .001*** | .001*** | .001* | .001*** |
| Covariance between Intercept and Slope | .038 | .035 | .030 | .029 |
Notes: Models 1-4 refer to different iterations of the 3-level MLM. Model 1 had no predictors of the variance in the slope. The only predictors are the predictors of the intercept. Model 2 included prenatal smoking as a predictor of the slope in the model. Model 3 includes activity level as a predictor of the slope on the model. Model 4 includes both prenatal smoking and activity level as predictors of the slope in the model.
*
p < .05;
**
p < .01;
***
p < .001.