Table 1 Sample structure by age and gender
| 1st grade | 2nd grade | 3rd grade | 4th grade | TOTAL | |
|---|---|---|---|---|---|
| Boys | 83 | 39 | 14 | 59 | 195 |
| Girls | 46 | 70 | 25 | 16 | 157 |
| TOTAL | 129 | 109 | 39 | 75 | 352 |
| Age - M (sd) | 16.0 (.51) | 17.0 (.56) | 17.80 (.57) | 18.73 (.53) | 17.06 (1.17) |
| 1st grade | 2nd grade | 3rd grade | 4th grade | TOTAL | |
|---|---|---|---|---|---|
| Boys | 83 | 39 | 14 | 59 | 195 |
| Girls | 46 | 70 | 25 | 16 | 157 |
| TOTAL | 129 | 109 | 39 | 75 | 352 |
| Age - M (sd) | 16.0 (.51) | 17.0 (.56) | 17.80 (.57) | 18.73 (.53) | 17.06 (1.17) |