Table 3.
Paired differences (graduation).
| Paired Differences | P Value (Paired t) | ||
|---|---|---|---|
| Mean | SD | ||
| Graduation (all students) | |||
| Predelay year 0 − postdelay year 1 | −6.64 | 6.41 | <.001 |
| Predelay year 0 − postdelay year 2 | 8.00 | 8.02 | <.001 |
| Predelay year 0 − postdelay year 3 | 7.50 | 7.22 | <.001 |
| Predelay year 0 − postdelay year 4 | 9.82 | 9.58 | <.001 |
| Graduation (African-American students) | |||
| Predelay year 0 − postdelay year 1 | −2.93 | 15.37 | .472 |
| Predelay year 0 − postdelay year 2 | 3.65 | 10.78 | .182 |
| Predelay year 0 − postdelay year 3 | 2.00 | 6.14 | .198 |
| Predelay year 0 − postdelay year 4 | 6.81 | 11.68 | .034 |
| Graduation (economically disadvantaged students) | |||
| Predelay year 0 − postdelay year 1 | −0.38 | 9.16 | .872 |
| Predelay year 0 − postdelay year 2 | 4.17 | 8.84 | .062 |
| Predelay year 0 − postdelay year 3 | 2.83 | 10.12 | .251 |
| Predelay year 0 − postdelay year 4 | 6.56 | 8.75 | .006 |
| Graduation (White students) | |||
| Predelay year 0 − postdelay year 1 | −1.44 | 6.08 | .359 |
| Predelay year 0 − postdelay year 2 | 2.50 | 4.94 | .046 |
| Predelay year 0 − postdelay year 3 | 3.28 | 4.13 | .004 |
| Predelay year 0 − postdelay year 4 | 4.67 | 6.58 | .008 |
SD = standard deviation.