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| Control | BST | In situ | |
| Boys | 9 | 7 | 6 |
| Girls | 8 | 8 | 8 |
| Mean age | 7.12 | 7.18 | 6.74 |
| Age rangea | (6-4 to 7-8) | (6-3 to 7-7) | (6-0 to 7-4) |
| Grade | 1st and 2nd | 1st and 2nd | K through 2nd |
Years-months.
