Table 1. Sample demographics.
| School year | Sample | Age (years) | ||
|---|---|---|---|---|
| Proposed | Actual | Mean | SD | |
| Year 1 | 150 | 146 | 6.8 | 0.7 |
| Year 6 | 350 | 350 | 11.3 | 1.0 |
| Year 9 | 350 | 563 | 14.2 | 1.2 |
| Year 11 | 350 | 292 | 16.3 | 1.2 |
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