Table 2.
Descriptive statistics for tasks assessed.
| Variable | Mean | SD | Min | Max |
|---|---|---|---|---|
| YEAR 1 | ||||
| Give-a-number | 3.38 | 1.88 | 0 | 6 |
| Numeral recognition | 4.76 | 4.28 | 0 | 15 |
| Nonverbal calculation | 23.30 | 16.83 | 0 | 66.67 |
| Discrete quantity discrimination | 66.80 | 16.53 | 36.67 | 100 |
| EF | 32.67 | 13.87 | 11 | 69 |
| IQ | 98.06 | 15.60 | 73 | 135 |
| Preliteracy (alphabet knowledge) | 12.97 | 9.18 | 0 | 26 |
| Mathematics achievement | 92.69 | 14.44 | 68 | 129 |
| YEAR 2 | ||||
| Give-a-number | 5.57 | 1.05 | 2 | 6 |
| Numeral recognition | 9.76 | 3.98 | 0 | 15 |
| Nonverbal calculation | 44.96 | 21.46 | 0 | 91.67 |
| Discrete quantity discrimination | 86.04 | 16.36 | 43.33 | 100 |
| EF | 46.02 | 13.22 | 15 | 70 |
| Mathematics achievement | 95.48 | 13.63 | 70 | 134 |
| KINDERGARTEN | ||||
| Word reading | 112.11 | 13.11 | 84 | 158 |
| Numerical operations | 106.63 | 11.83 | 75 | 146 |
N = 100 for all tasks.