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Descriptives.
| Boys | Girls | |
|---|---|---|
| Grade 7 | 46.8 (6.02) | 50.2 (6.69) |
| Havo | 46.1 (4.35) | 48.9 (7.07) |
| Vwo | 47.2 (6.91) | 51.5 (6.15) |
| Grade 9 | 52.9 (7.20) | 57.7 (6.97) |
| Havo | 50.7 (7.00) | 56.2 (7.04) |
| Vwo | 54.9 (6.87) | 59.4 (6.59) |
Note: Mean number of correct substitutions in 90 s with standard deviations in parentheses. Havo, higher general secondary education; Vwo, pre-university education.
