| Variable | df | SS | Mean Square | F Value | Pr > F |
| Letter-sound reading | 1 | 4480.69 | 4480.69 | 79.76 | <.0001 |
| Gender | 1 | 715.655 | 715.65 | 12.74 | 0.0007 |
| Age | 1 | 75.30 | 75.30 | 1.34 | 0.2512 |