Table 3.
Mean learning and memory performance (raw scores) on the Verbal Paired Associate Test and the California Verbal Learning Test (CVLT) in APOE ε4 carriers and non-carriers (SDs shown in parantheses)
| ε 4 non-carriers | ε 4 carriers | t-values/ U-values | p-values | Effect sizesa | |
| (n = 31) | (n = 39) | ||||
| *Verbal Paired Associate Test – learning (errors) | 33 (22.7) | 41 (22.2) | -1.51c | 0.14 | 0.52 |
| *Verbal Paired Associate Test – recall (errors) | 7 (4.2) | 9 (4.8) | -1.80c | 0.08 | 0.63 |
| CVLT | |||||
| List A Trial 1 recall | 5.8 (2.6) | 4.6 (2.2) | 2.14b | 0.04 | 0.51 |
| List A Trial 5 recall | 10.1 (3.8) | 8.5 (3.3) | 1.85b | 0.07 | 0.46 |
| *Total learning (trial 1–trial 5) | 42 (15) | 34.7 (11) | 2.34b | 0.02 | 0.57 |
| *Short delay free recall | 7.3 (4.3) | 6.1 (3.9) | 1.20b | 0.24 | 0.30 |
| Short delay cued recall | 9.3 (3.8) | 8.1 (3.4) | 1.35b | 0.18 | 0.34 |
| *Long delay free recall | 8.5 (4.3) | 6.8 (3.9) | 1.78b | 0.08 | 0.44 |
| Long delay cued recall | 9.1 (3.5) | 8.1 (3.5) | 1.18b | 0.24 | 0.29 |
| Percent recognition discriminability | 89 (10.1) | 84 (11.4) | 1.84b | 0.07 | 0.47 |
| Intrusions learning | 0.3 (0.7) | 0.8 (1.4) | 467c | 0.03 | -0.25 |
| Short delay intrusions | 0.2 (0.5) | 0.3 (0.6) | 559.7c | 0.45 | -0.09 |
| Long delay intrusions | 0.4 (0.6) | 0.7 (1.5) | 545c | 0.39 | -0.10 |
| Recognitions hits | 14.3 (1.8) | 13.9 (1.9) | 521.5c | 0.32 | -0.12 |
| Recognition false alarms | 3.0 (4.3) | 4.7 (4.2) | 413.5c | 0.02 | -0.27 |
| Response bias (recognition) | 0.09 (0.4) | 0.24 (0.4) | 462c | 0.09 | -0.20 |
| Percentage consistency | 75.7 (17.1) | 67.6 (15.9) | 395c | 0.01 | -0.30 |
Degrees of freedom for all parametric tests was 68
* According to Bonferoni correction, a p-value of 0.01 was regarded as significant for these scores
a For t-tests, Cohen's d, for nonparametric tests r were calculated
b Test statistics according to independent t-tests
c Test statistics according to Mann-Whitney U tests