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| Age group | 3 (n = 191) | 4 (n = 343) | 5 (n = 357) | 6 (n = 287) | 7 (n = 333) | 8 (n = 360) | 9 (n = 264) |
|---|---|---|---|---|---|---|---|
| Mean ± SD | 3.62 ± 0.27 | 4.47 ± 0.28 | 5.47 ± 0.28 | 6.46 ± 0.27 | 7.48 ± 0.28 | 8.50 ± 0.28 | 9.33 ± 0.23 |
| Range | 3.00–3.92 | 4.00–4.92 | 5.00–5.99 | 6.00–6.92 | 7.00–7.96 | 8.00–8.92 | 9.00–9.92 |
| Gender (M/F) | 83/108 | 185/158 | 185/172 | 149/138 | 161/172 | 159/201 | 140/124 |
