Table 2.
Mean (sd) cognitive ability test scores for the Lothian Birth Cohort 1921.
| Full sample |
Returning sample (attended all 3 waves) |
|||||
|---|---|---|---|---|---|---|
| 79 | 83 | 87 | 79 | 83 | 87 | |
| Verbal Fluency | 40.0 (12.3) | 39.8 (12.7) | 40.0 (12.3) | 42.1 (11.9) | 40.9 (12.1) | 40.1 (12.1) |
| Raven's | 31.2 (8.8) | 29.7 (9.2) | 27.8 (9.2) | 33.4 (8.3) | 31.1 (8.3) | 27.9 (9.1) |
| Logical Memory | 31.6 (12.8) | 33.0 (14.4) | 32.8 (14.7) | 34.8 (12.6) | 34.7 (13.8) | 32.8 (14.6) |
Note. For the full sample, N = 543–548 at age 79, N = 317–320 at age 83, and N = 202–207 at age 87. For the returning sample, N = 203 for Verbal Fluency, 196 for Raven's and 204 for Logical Memory.