| Group | Age | Grade | Sex | ||||
| Mean | Standard Deviation | 4th | 5th | 6th | F | M | |
| Intervention | 10.34 | 1.112 | 98 | 87 | 81 | 110 | 156 |
| Control 1 | 10.39 | 1.192 | 69 | 63 | 82 | 105 | 109 |
| Control 2 | 10.29 | .999 | 115 | 116 | 99 | 155 | 175 |