Table 3. Quadratic Equation for Each Group and Episodic Memory Estimates at Different Agesa.
| Group | β1 Value (SE) | β2 Value (SE) | c (Intercept) | Episodic Memory Estimates by Age, y | ||
|---|---|---|---|---|---|---|
| 65 | 75 | 85 | ||||
| Aβ-negative ε4 noncarriers | 0.211 (0.066) | −0.001 (0.0001) | −8.122 | −0.085 | 0.139 | 0.093 |
| Aβ-negative ε4 carriers | 0.211 (0.066) | −0.001 (0.0001) | −7.955 | −0.002 | 0.194 | 0.116 |
| Aβ-positive ε4 noncarriers | 0.211 (0.066) | −0.002 (0.0001) | −6.660 | 0.068 | −0.142 | −0.684 |
| Aβ-positive ε4 carriers | 0.211 (0.066) | −0.002 (0.0004) | −5.947 | −0.107 | −0.611 | −1.489 |
Abbreviation: Aβ, β-amyloid.
a
The quadratic equation used to calculate all estimates is given in the Association of Age With Memory Change subsection of Results section.