Table 1 Distributions of age and sex among eligible students and students who consented to participate.
| Â | Â | Â | EX2002 | EX2004 | EX2006 |
|---|---|---|---|---|---|
Sampling frames | N | Number of eligible students | 1700 | 2331 | 2107 |
| Â | Â | Semester when first assessed | 6th out of 6 | 2nd out of 6 | 6th out of 6 |
| Â | Â | Expected graduation | end of 2002 | end of 2004 | end of 2006 |
| Â | Sex | % of females | 88.2 | 87.9 | 86.0 |
| Â | Â | % of males | 11.8 | 12.1 | 14.0 |
| Â | Age | Mean | 30.5 | 28.3 | 29.8 |
| Â | Â | Standard deviation | 7.4 | 7.2 | 7.1 |
| Â | Â | Range | 21 - 54 | 20 - 57 | 21 - 55 |
|  |  | % aged ≤24 | 27.5 | 41.9 | 29.2 |
| Â | Â | % aged 25 - 34 | 43.2 | 36.3 | 46.2 |
|  |  | % aged ≥35 | 29.3 | 21.8 | 24.6 |
Cohorts | N | Number in cohort | 1155 | 1702 | 1459 |
| Â | % | Response rate | 67.9 | 73.0 | 69.2 |
| Â | Sex | % of females | 89.2 | 89.1 | 89.0 |
| Â | Â | % of males | 10.8 | 10.9 | 11.0 |
| Â | Age | Mean | 30.5 | 28.4 | 29.9 |
| Â | Â | Standard deviation | 7.4 | 7.2 | 7.1 |
| Â | Â | Range | 21 - 52 | 20 - 52 | 21 - 54 |
|  |  | % ≤24 | 28.4 | 42.0 | 28.9 |
| Â | Â | % 25 - 34 | 42.1 | 36.1 | 46.2 |
|  |  | % ≤35 | 29.5 | 21.9 | 24.9 |
| Â | Rate | Highest response rate to date | 91.7 | 92.1 | 78.1 |
| Â | Â | Lowest response rate to date | 80.8 | 69.0 | 78.1 |