Table 2. β-coefficients and 95% confidence intervals (CI) for age-related differences in mean cognitive performance and decline in different domains (T-scores) in relation to the Eichner Index (n=544).
| Eichner Index | Spatial/fluid abilities | Verbal ability | Memory | Perceptual speed | Component scorea | |
| β (95% CI) | β (95% CI) | β (95% CI) | β (95% CI) | β (95% CI) | ||
| Intercept | A (Ref) | 68.23 (60.39 to 76.08) | 48.69 (43.79 to 53.59) | 60.45 (51.01 to 69.88) | 68.37 (62.01 to 74.72) | 62.19 (56.88 to 67.51) |
| B | -6.90 (-17.40 to 3.60) | -6.94 (-12.48 to -1.40) | -4.59 (-18.49 to 9.31) | -1.79 (-13.67 to 10.08) | -3.23 (-11.56 to 5.10) | |
| C | -10.55 (-25.53 to 4.43) | -1.95 (-9.73 to 5.83) | -7.48 (-25.81 to 10.83) | -6.09 (-16.49 to 4.31) | -3.07 (-12.03 to 5.90) | |
| Slope (linear age up to 65)b | ||||||
| A (Ref) | -0.19 (-0.31 to -0.06) | 0.09 (0.04 to 0.15) | -0.14 (-0.29 to 0.01) | -0.24 (-0.34 to -0.14) | -0.14 (-0.22 to -0.06) | |
| B | 0.07 (-0.11 to 0.24) | 0.10 (0.02 to 0.18) | 0.01 (-0.22 to 0.23) | -0.01 (-0.20 to 0.19) | 0.02 (-0.11 to 0.16) | |
| C | 0.10 (-0.13 to 0.34) | -0.00 (-0.11 to 0.11) | 0.07 (-0.22 to 0.36) | 0.03 (-0.14 to 0.20) | -0.01 (-0.15 to 0.13) | |
| Slope (linear age from 65)b | ||||||
| A (Ref) | -0.30 (-0.39 to -0.21) | -0.18 (-0.26 to -0.11) | -0.21 (-0.31 to -0.10) | -0.56 (-0.65 to -0.46) | -0.36 (-0.43 to -0.28) | |
| B | -0.16 (-0.30 to -0.03) | -0.08 (-0.19 to 0.05) | -0.09 (-0.24 to 0.05) | -0.04 (-0.18 to 0.09) | -0.04 (-0.17 to 0.10) | |
| C | -0.15 (-0.28 to -0.02) | -0.10 (-0.21 to 0.01) | -0.12 (-0.26 to 0.03) | -0.14 (-0.27 to 0.00) | -0.10 (-0.27 to 0.04) |
Model with age as timescale, adjusted for sex, education, birth cohort, and practice effect. The reference group was Eichner Index A.
aCognitive component of tests for spatial/fluid abilities, verbal fluency, memory, and perceptual speed.
bA knot was placed at age 65 for spatial/fluid, memory, and perceptual speed and at age 70 for verbal ability.