Grade (Time1) | n | male | female | Grade (Time 2) | n | male | female | |
Cohort 1 | 5 | 395 | 194 | 201 | 6 | 354 | 170 | 184 |
Cohort 2 | 6 | 399 | 180 | 219 | 7 | 220 | 89 | 131 |
Cohort 3 | 7 | 401 | 180 | 221 | 8 | 366 | 161 | 205 |
Cohort 4 | 8 | 324 | 186 | 138 | 9 | 298 | 170 | 128 |
Total Independent N | 1519 | 1238 |