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Longitudinal data coverage
| Age (years) | 7 | 8 | 9 | 12 | 15 |
|---|---|---|---|---|---|
| 7 | 0.82 | — | — | — | — |
| 8 | 0.71 | 0.86 | — | — | — |
| 9 | 0.53 | 0.63 | 0.67 | — | — |
| 12 | 0.25 | 0.24 | 0.24 | 0.26 | — |
| 15 | 0.52 | 0.62 | 0.49 | 0.19 | 0.64 |
Note: Diagonal values indicate the proportion of the total sample that had cognitive data at each age. Off-diagonal values represent the proportion of the total sample available to calculate a covariance between cognitive measures at two ages.
