Table 1 Numbers of children and response rates.
| 1973 | 1988 | 2003 | |
|---|---|---|---|
| Total available | 818 | 965 | 1205 |
| Completed questionnaires (%) | 817 (99.9) | 965 (100) | 1148 (95.3) |
| Undertook exercise test (%) | 812 (99.3) | 960 (99.5) | 1022 (84.8) |
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