TABLE 2.
Comparison of sample and cognitive characteristics for group analysis (mean ± SD).
| Demographic variable | Group | Test statistic | p‐Bonferroni | |||||
|---|---|---|---|---|---|---|---|---|
| PC: Posterior‐cortical (N = 19) | CI: Cognitively intact (N = 11) | HC: Healthy controls (N = 20) | ||||||
| Mean/N | SD | Mean/N | SD | Mean/N | SD | |||
| Age (year) | 71.30 | 8.76 | 60.10 | 5.24 | 63.90 | 7.84 | F = 8.16* |
PC vs. HC = .013 PC vs. CI = .002 |
| Sex (female) | 11 (57%) | 8 (75%) | 10 (50%) | Φ = .150 | – | |||
| Education (year) | 12.68 | 3.37 | 15.10 | 2.13 | 14.69 | 3.18 | F = 2.83 | – |
| MoCA | 24.70 | 2.60 | 27.00 | 2.05 | 26.45 | 2.16 | F = 4.32* | PC vs. CI = .042 |
| GAI | 2.50 | 5.44 | 1.44 | 2.35 | .45 | .99 | H = 2.008 | – |
| GDS | 2.45 | 1.73 | 2.50 | 2.37 | .95 | .15 | H = 9.043* | PC vs. HC = .012 |
| Dis. duration (year) | 4.60 | 3.02 | 5.00 | 3.33 | – | ‐ | U = 112.0 | – |
| MCI | 7 (37%) | 1 (9%) | – | – | Φ = −.267 | – | ||
| LEDD (mg) | 458.75 | 266.62 | 631.13 | 384.09 | – | – | U = 122.0 | – |
| MDS–UPDRS Total | 34.11 | 15.79 | 29.33 | 9.87 | – | – | U = 66.0 | – |
| MDS–UPDRS Motor | 17.30 | 9.86 | 10.50 | 6.40 | – | – | U = 57.0 | – |
| Hoehn and Yahr | – | – | Φ = .316 | – | ||||
| 1 | 12 (63%) | 9 (81%) | – | – | – | – | ||
| 2 | 6 (32%) | 1 (9%) | – | – | – | – | ||
| 3 | 1 (5%) | 0 | – | – | – | – | ||
| Cognitive variable | z‐Score | SD | z‐Score | SD | z‐Score | SD | Test statistic | p‐Bonferroni |
| Memory | ||||||||
| Visual: BVMT | −.74 | 1.18 | .76 | .58 | .80 | 1.17 | F = 8.92* |
PC vs. HC = < .001 PC vs. CI = .016 |
| Verbal: HVLT | .15 | .77 | 1.06 | .40 | .32 | .91 | F = 5.21* | PC vs. HC = < .048 |
| Language | ||||||||
| Category fluency | −.22 | .90 | 1.11 | 1.29 | .97 | 1.30 | F = 7.12* |
PC vs. HC = .005 PC vs. CI = .012 |
| Boston naming | −.36 | .77 | .00 | .68 | .04 | .89 | F = 1.56 | – |
| Executive | ||||||||
| Card sorting | −.28 | .93 | 1.09 | .83 | 1.08 | .86 | F = 3.46 | – |
| TMT‐B | .32 | .67 | .79 | .98 | .97 | .69 | F = 3.27* | PC vs. HC = .044 |
| Visuospatial | ||||||||
| CLOX | .40 | .99 | .91 | .55 | .48 | 1.07 | H = 2.14 | – |
| JLO | .11 | .87 | .03 | .93 | .27 | .86 | H = .529 | – |
| Attention/WM | ||||||||
| TMT‐A | .32 | .67 | .79 | .98 | .93 | .68 | F = 4.31* | PC vs. HC = .017 |
| STROOP | −.46 | .70 | −0.11 | .56 | .64 | 1.38 | H = 8.83* | PC vs. HC = .009 |
Abbreviations: BVMT, Brief Visuospatial Memory Test (delayed); Dis., disease; GAI, Geriatric Anxiety Inventory; GDS, Geriatric Depression Scale; HVLT, Hopkin's Verbal Learning Test (delayed); JLO, Judgment of Line Orientation; LEDD, levodopa equivalent daily dose; MoCA, Montreal Cognitive Assessment; MCI, mild cognitive impairment; MDS‐UPDRS, Movement Disorder Society Unified Parkinson's Disease Rating Scale; TMT, Trail‐Making Test; WM, working memory.
*p < .05 Note.