Table 1.
PiB group differences on demographic variables, cognitive and metacognitive measures.
| High PiB | Low PiB | Difference test (a) | |||||
|---|---|---|---|---|---|---|---|
|
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| N | Mean | SD | N | Mean | SD | p | |
| Demographics | |||||||
| Age | 11 | 75.73 | 6.05 | 28 | 71.89 | 5.45 | 0.115 |
| Education, years | 11 | 16.82 | 1.89 | 28 | 17.61 | 2.02 | 0.170 |
| Gender, n | 9F/2M | 15F/13M | 0.103 (b) | ||||
| GDS | 11 | 4.45 | 2.73 | 28 | 3.86 | 3.04 | 0.473 |
| MMSE | 11 | 29.18 | 0.98 | 28 | 28.96 | 1.23 | 0.755 |
|
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| Cognitive measures | |||||||
| CVLT Immediate Free Recall | 10 | 40.20 | 9.08 | 28 | 50.46 | 10.55 | 0.007 |
| CVLT Short-Delay Free Recall | 10 | 8.00 | 4.52 | 28 | 10.75 | 2.86 | 0.097 |
| CVLT Short-Delay Cued Recall | 10 | 10.90 | 2.81 | 28 | 12.14 | 2.73 | 0.208 |
| CVLT Long-Delay Free Recall | 10 | 9.40 | 4.03 | 28 | 11.39 | 3.27 | 0.154 |
| CVLT Long-Delay Cued Recall | 10 | 10.20 | 3.58 | 28 | 11.86 | 2.65 | 0.196 |
| CVLT Recognition Hits | 10 | 13.80 | 3.52 | 28 | 14.21 | 1.73 | 0.855 |
| z CVLT delayed performance | 10 | −0.29 | 1.02 | 28 | 0.13 | 0.78 | 0.281 |
| VR-I Immediate Recall Total | 11 | 76.82 | 13.67 | 28 | 81.46 | 13.18 | 0.310 |
| VR-II Delayed Recall Total | 11 | 53.64 | 24.76 | 28 | 67.39 | 19.52 | 0.073 |
| VR Recognition Total | 11 | 42.64 | 4.48 | 28 | 45.21 | 2.33 | 0.073 |
| z VR delayed performance | 11 | −0.16 | 1.11 | 28 | 0.50 | 0.69 | 0.063 |
| Stroop Correct in 60 s | 11 | 48.73 | 13.95 | 28 | 50.11 | 12.50 | 0.767 |
| Digit Span Total | 11 | 17.09 | 3.86 | 28 | 16.50 | 3.97 | 0.492 |
| Listening Span Total Recalled | 11 | 41.73 | 6.90 | 27 | 47.04 | 8.28 | 0.071 |
| Letter Fluency Total | 11 | 48.64 | 11.36 | 27 | 47.74 | 9.62 | 0.859 |
| Category Fluency Total | 11 | 33.09 | 12.09 | 27 | 37.19 | 8.51 | 0.311 |
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| Metacognitive measures | |||||||
| Off-line monitoring | |||||||
| SR relative to other people | 11 | 2.09 | 0.54 | 27 | 1.63 | 0.63 | 0.039 (c) |
| SR relative to 20 years ago | 11 | 2.82 | 0.75 | 27 | 2.93 | 0.55 | 0.872 (c) |
| On-line monitoring | |||||||
| SR CVLT Post-delay | 10 | 47.70 | 20.48 | 28 | 55.50 | 21.63 | 0.426 |
| SR VR Post-delay | 11 | 66.00 | 21.34 | 28 | 70.29 | 19.34 | 0.574 |
| SR Stroop | 11 | 53.18 | 27.55 | 28 | 60.25 | 20.22 | 0.483 |
| SR Digit Span | 11 | 54.36 | 23.29 | 28 | 57.25 | 23.12 | 0.651 |
| SR Listening Span | 11 | 33.55 | 25.16 | 27 | 36.89 | 18.61 | 0.499 |
| SR Letter Fluency | 11 | 57.36 | 22.67 | 27 | 53.07 | 21.73 | 0.520 |
| SR Category Fluency | 11 | 55.45 | 19.29 | 27 | 57.63 | 17.39 | 0.872 |
| Composite on-line SR (d) | 11 | 53.05 | 18.19 | 28 | 56.14 | 15.04 | 0.391 |
Notes. (a)= Mann-Whitney U Test; (b)= Chi-square difference test; (c)= Mann-Whitney U Test (Z statistic adjusted for ties); (d)= Given missing data for 2 subjects, their composite on-line SR score was calculated on the basis on four and six on-line SR measures, respectively, rather than on the seven on-line SR measures. GDS= Geriatric Depression Scale; MMSE= Mini Mental State Examination; CVLT: California Verbal Learning Test; VR= Visual Reproduction test; SR= Self-reports.