TABLE 4.
Simple slope results by age group for performance on the elicited imitation delayed condition1
| Choline (n = 30), γ ± SE | Placebo (n = 29), γ ± SE | t test [t(28), P] | Effect size, d | |
| Delayed condition | ||||
| Items | ||||
| Young | 14.24 ± 3.84 | 4.43 ± 4.04 | −2.41, 0.023 | 0.54 |
| Old | −0.71 ± 3.98 | 4.23 ± 3.90 | 1.21, 0.235 | — |
| Ordered pairs | ||||
| Young | 18.97 ± 3.65 | 10.39 ± 4.00 | −2.18, 0.038 | 0.50 |
| Old | 2.69 ± 3.79 | 7.79 ± 3.73 | 1.31, 0.201 | — |
| Immediate condition | ||||
| Items | ||||
| Young | 8.48 ± 4.23 | 13.72 ± 4.41 | 1.18, 0.125 | — |
| Old | 2.59 ± 4.36 | 3.89 ± 4.24 | 0.29, 0.386 | — |
| Ordered pairs | ||||
| Young | 8.75 ± 4.45 | 20.01 ± 4.80 | 2.36, 0.013 | −0.46 |
| Old | 11.46 ± 4.61 | 5.50 ± 4.46 | −1.27, 0.107 | — |
1
The simple slope was used to estimate the change in delayed performance (%) per 6-mo unit of treatment. The change over 9 mo of treatment can be computed as 1.5 times the change per 6 mo of treatment.