Table 3. Average Measures and Standard Deviations of CO-Span and Math Tasks Across Countries, Gender and Range Measures.
| Group | n | Task (correct response in ms) |
|||||
|---|---|---|---|---|---|---|---|
| CO-Span |
CO-Span Math (percent) |
||||||
| M | SD | Range | M | SD | Range | ||
| Finland | |||||||
| Boys | 83 | 4.40 | 1.08 | 90.18 | 10.03 | ||
| Girls | 104 | 4.32 | 1.16 | 89.38 | 8.75 | ||
| Total | 187 | 4.35 | 1.12 | 3.94-4.58 | 89.74 | 9.33 | 87.19-92.46 |
| Sweden | |||||||
| Boys | 71 | 3.72 | 1.16 | 91.42 | 7.12 | ||
| Girls | 77 | 3.73 | 1.15 | 89.96 | 9.92 | ||
| Total | 148 | 3.72 | 1.15 | 3.6-4.10 | 90.66 | 8.69 | 87.47-94.32 |
| Norway | |||||||
| Boys | 87 | 4.17 | 1.14 | 89.26 | 8.04 | ||
| Girls | 107 | 3.86 | 1.14 | 89.53 | 9.72 | ||
| Total | 194 | 4.00 | 1.25 | 3.73-4.42 | 89.41 | 8.98 | 85.95-91.49 |
| Iceland | |||||||
| Boys | 82 | 3.90 | 0.93 | 90.20 | 8.12 | ||
| Girls | 82 | 4.00 | 1.06 | 90.21 | 8.93 | ||
| Total | 164 | 3.95 | 1.00 | 3.57-4.34 | 90.21 | 8.51 | 88.74-91.53 |
Note. CO-span = Child operation span task, a measure of complex working memory. CO-span math = operation span, the concurrent math task in percent correct response. Range = mean value range across individual schools.