Table 2.
ANCOVA models, and solution for final model
| Initial model | Augmented Model | Final Model | Solution in final model | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Effect | Level | df | F | p < | df | F | p < | df | F | p < | Parameter Estimate | Std Error | Confidence Limits | |
| Intercept | 1.65 | 2.98 | -4.22 | 7.51 | ||||||||||
| Treatment assignment (tx) | SS | 1 | 2.79 | 0.0974 | 1 | 3.24 | 0.0722 | 1 | 3.84 | 0.0510 | -8.18 | 4.17 | -16.39 | .04 |
| Race | Non-white | 1 | 1.02 | 0.3165 | 1 | 0.79 | 0.3754 | 1 | 1.80 | 0.1827 | -2.03 | 1.51 | -5.03 | 0.97 |
| Sex | Male | 1 | 0.06 | 0.8136 | 1 | 0.13 | 0.7177 | 1 | 0.00 | 0.9977 | 0.00 | 0.94 | -1.86 | 1.86 |
| Phase I weight change | 1 | 0.55 | 0.4644 | 1 | 2.92 | 0.0903 | 1 | 2.62 | 0.1102 | 0.19 | 0.12 | -0.04 | 0.42 | |
| Randomization weight | 1 | 0.67 | 0.4111 | 1 | 0.09 | 0.7670 | 1 | 0.05 | 0.8248 | -0.01 | 0.03 | -0.06 | 0.05 | |
| Phase I weight change*tx | SS | 1 | 3.03 | 0.0829 | 1 | 4.45 | 0.0359 | -0.32 | 0.15 | -0.61 | -0.02 | |||
| Randomization weight*tx | SS | 1 | 2.59 | 0.1088 | 1 | 2.46 | 0.1176 | 0.06 | 0.04 | -0.02 | 0.14 | |||
| Education | 1. High School or less | 3 | 3.71 | 0.011 | 4.44 | 1.34 | 1.80 | 7.09 | ||||||
| 2. Some College | 1.32 | 0.86 | -0.39 | 3.02 | ||||||||||
| 3. College degree | 0.69 | 0.92 | -1.12 | 2.50 | ||||||||||
| 5. Part college (reference) | 0.00 | . | . | . | ||||||||||
| Phase II %attendance | 1. < 50% | 4 | 3.62 | 0.006 | 2.30 | 1.33 | -0.35 | 4.95 | ||||||
| 2. 50-63% | 4.35 | 1.13 | 2.13 | 6.56 | ||||||||||
| 3. 75% | 3.11 | 1.11 | 0.93 | 5.30 | ||||||||||
| 4. 87.5% | 2.53 | 1.07 | 0.43 | 4.63 | ||||||||||
| 5. 100% (reference) | 0.00 | . | . | . | ||||||||||