Table 3.
Descriptive statistics (mean ± standard deviation) of performance in COG (general attention ability), DT (multiple choice reaction performance under time pressure), and ZVT (information processing speed)
| Measure | n1/n2 | December 2008/January 2009 | April 2009 | June 2009 | April 2015 | ||||
|---|---|---|---|---|---|---|---|---|---|
| Young‐old | Old‐old | Young‐old | Old‐old | Young‐old | Old‐old | Young‐old | Old‐old | ||
| COG sum reactions | 9/12 | 327.1 ± 50.2 | 285.2 ± 45.7 | 341.6 ± 47.2 | 307.6 ± 46.8 | 362.9 ± 34.8 | 331.2 ± 42.1 | 352.4 ± 55.8 | 336.0 ± 75.3 |
| COG errors (%) | 9/12 | 3.9 ± 5.8 | 1.4 ± 1.5 | 2.0 ± 1.6 | 0.8 ± 0.8 | 0.8 ± 0.7 | 1.4 ± 1.0 | 1.5 ± 1.3 | 1.8 ± 1.2 |
| DT correct reactions | 9/12 | 201.6 ± 27.9 | 202.3 ± 28.1 | 218.3 ± 20.9 | 215.5 ± 23.6 | 229.4 ± 20.2 | 218.7 ± 31.3 | 208.0 ± 38.7 | 206.7 ± 29.2 |
| ZVT processing time (sec) | 9/11 | 92.6 ± 17.1 | 109.6 ± 35.4 | 82.0 ± 17.0 | 87.6 ± 17.9 | 74.4 ± 11.7 | 81.4 ± 16.8 | 88.4 ± 21.4 | 105.8 ± 24.8 |
n1, sample size of age group young‐old; n2, sample size of age group old‐old.