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| Groups (of Sample studied) | Age (years) | Boys(n) | Girls(n) | Total (n) |
|---|---|---|---|---|
| 1 | 5.5.99 | 15 | 15 | 30 |
| 2 | 6.6.99 | 15 | 15 | 30 |
| 3 | 7.7.99 | 15 | 15 | 30 |
| 4 | 8.8.99 | 15 | 15 | 30 |
| 5 | 9.9.99 | 15 | 20 | 35 |
| 6 | 10.10.99 | 15 | 15 | 30 |
| 7 | 11.11.99 | 15 | 15 | 30 |
| 8 | 12.12.99 | 15 | 15 | 30 |
| 9 | 13.13.99 | 15 | 15 | 30 |
| 10 | 14.14.99 | 15 | 15 | 30 |
| 11 | 15.15.99 | 15 | 15 | 30 |
| Total | 165 | 170 | 335 |
