The achievement gap is largely set by age 5: IQ/test scores in standard deviations, by parent income quartile
| Age | Parent income in lowest quartile | Parent income in lowest quartile | Parent income in highest quartile | Parent income in highest quartile |
|---|---|---|---|---|
| 0 | -0.1206 | 0.033147 | ||
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 | -0.28939 | 0.486972 | ||
| 5 | -0.42535 | 0.53804 | ||
| 6 | ||||
| 7 | -0.32933 | 0.485797 | ||
| 8 | -0.39463 | -0.41495 | 0.432994 | 0.361795 |
| 9 | -0.40094 | 0.286091 | ||
| 10 | -0.44016 | 0.321102 | ||
| 11 | -0.32139 | 0.360868 | ||
| 12 | -0.37427 | 0.424476 | ||
| 13 | -0.32371 | 0.398653 | ||
| 14 | -0.42176 | 0.41377 |
Note: IQ scores are available through age 8 and are represented by a solid line. After age 8, math test scores are shown. A 3-year moving average is used for math scores, represented by a dotted line.
Source: Adapted from Council of Economic Advisers (2014)