| 7–9 years old (N = 29) | 10–11 years old (N = 72) | ||
---|---|---|---|---|
 | Median | Interquartile range | Median | Interquartile range |
Verbal label | 21 | 15.5–24 | 21 | 17–24 |
Percentage | 22 | 17.5–26 | 23.5 | 18.25–27 |
Proportion-word | 22 | 17.5–27 | 19 | 14.25–24 |
Proportion-notation | 20 | 15–27 | 18.5 | 15–23 |
Pie chart | 26 | 24.5–30 | 24.5 | 18–28 |
Mixed | 22 | 17–26 | 17.5 | 14–22 |