Table 4.
Fixed Effects | B | SE | t | p-value | Variance-Covariance Components Test | ||
---|---|---|---|---|---|---|---|
| |||||||
Deviance | χ2 statistic | p-value | |||||
Effects of Time | |||||||
| |||||||
Intercept | 6.746 | 0.473 | 14.270 | <0.001 | |||
Age | 0.006 | 0.542 | 0.012 | 0.991 | 4918.315 | 1602.266 | <0.001 |
| |||||||
Linear Effect of Time | 1.520 | 0.409 | 3.718 | <0.001 | |||
Age | 0.291 | 0.465 | 0.626 | 0.532 | 4894.309 | 23.691 | <0.001 |
| |||||||
Quadratic Effect of Time | -0.323 | 0.080 | -4.060 | <0.001 | |||
Age | -0.801 | 0.091 | -0.891 | 0.374 | 4878.495 | 15.814 | 0.002 |
| |||||||
Effects of Gender | |||||||
| |||||||
Intercept | 6.750 | 0.473 | 14.281 | <0.001 | |||
Age | -0.027 | 0.540 | -0.049 | 0.961 | |||
Gender | 0.923 | 0.942 | 0.980 | 0.328 | 4919.039 | 1599.520 | <0.001 |
| |||||||
Linear Effect of Time | 1.517 | 0.409 | 3.710 | <0.001 | |||
Age | 0.305 | 0.461 | 0.662 | 0.509 | |||
Gender | -0.474 | 0.817 | -0.580 | 0.562 | 4894.508 | 24.531 | <0.001 |
| |||||||
Quadratic Effect of Time | -0.323 | 0.080 | -4.051 | <0.001 | |||
Age | -0.083 | 0.090 | -0.922 | 0.357 | |||
Gender | 0.055 | 0.162 | 0.342 | 0.733 | 4882.176 | 12.332 | 0.007 |
| |||||||
Effects of Race | |||||||
| |||||||
Intercept | 6.762 | 0.473 | 14.295 | <0.001 | |||
Age | -0.027 | 0.540 | -0.049 | 0.961 | |||
Contrast 1 | -0.796 | 1.261 | -0.631 | 0.529 | |||
Contrast 2 | -2.144 | 1.417 | -1.513 | 0.131 | 4915.883 | 1596.527 | <0.001 |
| |||||||
Linear Effect of Time | 1.483 | 0.398 | 3.723 | <0.001 | |||
Age | 0.305 | 0.462 | 0.662 | 0.509 | |||
Contrast 1 | 0.654 | 1.069 | 0.612 | 0.541 | |||
Contrast 2 | 1.629 | 1.174 | 1.387 | 0.167 | 4893.702 | 22.181 | <0.001 |
| |||||||
Quadratic Effect of Time | -0.317 | 0.077 | -4.107 | <0.001 | |||
Age | -0.083 | 0.09 | -0.992 | 0.357 | |||
Contrast 1 | -0.098 | 0.205 | -0.475 | 0.635 | |||
Contrast 2 | -0.308 | 0.223 | -1.381 | 0.169 | 4878.387 | 15.315 | 0.002 |
Note. Race Contrast 1 compared differences between White and Black adolescents. Race Contrast 2 compared Black adolescents to adolescents who belonged to the “Other” racial group.