Table 1.
Descriptive Statistics
| Variables | n | Min | Max | M | SD |
|---|---|---|---|---|---|
| Preschool age (months) | 250 | 45.00 | 70.00 | 56.43 | 4.70 |
| 1st grade age (months) | 183 | 75.70 | 96.23 | 83.57 | 4.27 |
| Income-to-needs ratio | 243 | .10 | 6.40 | 2.17 | 1.43 |
| Mean RT | 250 | 471.45 | 1052.25 | 802.41 | 100.92 |
| Attentional fluctuations (CoV) | 250 | .18 | .71 | .33 | .10 |
| Task accuracy (%) | 250 | 48.77 | 100.00 | 83.12 | 10.95 |
| Cognitive flexibility (%) | 249 | .00 | 100.00 | 68.61 | 33.04 |
| Math Readiness | 250 | 2.00 | 27.00 | 14.77 | 4.16 |
| Reading readiness | 250 | 1.00 | 28.00 | 11.06 | 5.09 |
| 1st grade academic performance | 188 | 1.00 | 5.00 | 3.60 | .91 |