Table 3.
Rates of age-associated decline in persons who were not diagnosed with dementia
| Test | Waves dropped | N | Est. | Std. Error | 95% CI |
|---|---|---|---|---|---|
| Free Recall | None | 822 | −0.201 | 0.019 | (−0.239, −0.162) |
| 1 | 666 | −0.154 | 0.021 | (−0.195, −0.113) | |
| 2 | 543 | −0.107 | 0.023 | (−0.152, −0.061) | |
| 3 | 446 | −0.057 | 0.026 | (−0.107, −0.006) | |
| 4 | 335 | −0.009 | 0.032 | (−0.071, 0.053) | |
| Category Fluency | None | 827 | −0.521 | 0.031 | (−0.582, −0.460) |
| 1 | 668 | −0.478 | 0.037 | (−0.550, −0.406) | |
| 2 | 545 | −0.484 | 0.042 | (−0.567, −0.401) | |
| Letter Fluency | None | 826 | −0.397 | 0.036 | (−0.467, −0.326) |
| 1 | 668 | −0.350 | 0.042 | (−0.433, −0.267) | |
| 2 | 545 | −0.354 | 0.049 | (−0.450, −0.258) | |
| Trailmaking Speed | None | 802 | −0.014 | 0.001 | (−0.015, −0.012) |
| 1 | 651 | −0.013 | 0.001 | (−0.015, −0.012) | |
| 2 | 532 | −0.013 | 0.001 | (−0.015, −0.011) | |
| Estimated Verbal IQ | None | 717 | 0.020 | 0.016 | (−0.010, 0.051) |
| 1 | 574 | 0.009 | 0.020 | (−0.031, 0.048) | |
| 2 | 474 | 0.005 | 0.023 | (−0.040, 0.049) |
Note. “Waves dropped” is the number of observations on each study participant at the end of that participant’s follow-up period excluded from analysis. N is the number of study participants included in the analysis. Estimates are in units of points per year on each measure, except for Trailmaking, which is in units of speed (units per minute per year). CI = confidence interval.