Table 1. Baseline Characteristics.
Mean (standard deviation) and counts (percentages) of baseline characteristics among those with plasma Aβ samples that passed quality controls versus not. P-values are from Wilcoxon rank-sum or Fisher’s exact tests.
| MCI | |||||
|---|---|---|---|---|---|
| Variable | N | Without Aβ (N=364) | With Aβ (N=405) | Combined (N=769) | P-value |
|
|
|||||
| Age [yrs] | 769 | 73.70 (7.42) | 72.23 (7.10) | 72.93 (7.28) | 0.008 |
| Gender : Female | 769 | 182 (50%) | 170 (42%) | 352 (46%) | 0.030 |
| Education [yrs] | 769 | 14.57 (3.12) | 14.70 (3.05) | 14.64 (3.08) | 0.423 |
| APOE-ε4 alleles: | 769 | 0.007 | |||
| 0 | 146 (40%) | 199 (49%) | 345 (45%) | ||
| 1 | 186 (51%) | 161 (40%) | 347 (45%) | ||
| 2 | 32 (9%) | 45 (11%) | 77 (10%) | ||
| ADAS11 | 765 | 11.33 (4.31) | 11.23 (4.44) | 11.28 (4.38) | 0.636 |
| ADL | 768 | 46.00 (4.94) | 45.91 (4.63) | 45.95 (4.77) | 0.455 |
| MMSE | 769 | 27.13 (1.89) | 27.39 (1.81) | 27.27 (1.85) | 0.054 |
| Urea Nitrogen | 689 | 16.90 (4.11) | 17.66 (5.16) | 17.34 (4.76) | 0.290 |
| Creatinine | 689 | 0.869 (0.190) | 0.915 (0.227) | 0.896 (0.213) | 0.010 |
| Total Protein | 689 | 7.082 (0.431) | 7.053 (0.449) | 7.065 (0.441) | 0.240 |
| Albumin | 689 | 4.161 (0.233) | 4.175 (0.246) | 4.169 (0.240) | 0.466 |
| Total Cholesterol | 688 | 215.2 (37.2) | 213.1 (37.1) | 214.0 (37.1) | 0.480 |
| Hemoglobin | 686 | 13.95 (1.18) | 14.11 (1.25) | 14.04 (1.22) | 0.126 |
| Platelets | 686 | 233.1 (54.6) | 224.9 (52.8) | 228.4 (53.7) | 0.068 |
| AD | |||||
|---|---|---|---|---|---|
| Variable | N | Without Aβ (N=181) | With Aβ (N=225) | Combined (N=406) | P-value |
|
|
|||||
| Age [yrs] | 406 | 74.88 (9.44) | 74.35 (9.18) | 74.58 (9.29) | 0.533 |
| Gender : Female | 406 | 102 (56%) | 139 (62%) | 241 (59%) | 0.309 |
| Education [yrs] | 406 | 14.40 (3.38) | 14.14 (3.08) | 14.25 (3.21) | 0.290 |
| APOE-ε4 alleles: | 358 | 0.626 | |||
| 0 | 64 (39%) | 86 (44%) | 150 (42%) | ||
| 1 | 78 (48%) | 84 (43%) | 162 (45%) | ||
| 2 | 21 (13%) | 25 (13%) | 46 (13%) | ||
| ADAS11 | 403 | 24.35 (9.82) | 24.07 (10.28) | 24.19 (10.07) | 0.669 |
| ADL | 406 | 67.7 (10.0) | 68.0 (10.3) | 67.9 (10.2) | 0.491 |
| MMSE | 406 | 20.32 (4.72) | 20.37 (4.69) | 20.35 (4.70) | 0.900 |
| Urea Nitrogen | 405 | 17.27 (4.87) | 17.18 (4.96) | 17.22 (4.91) | 0.779 |
| Creatinine | 405 | 0.904 (0.202) | 0.860 (0.208) | 0.879 (0.206) | 0.010 |
| Total Protein | 405 | 7.171 (0.437) | 7.141 (0.477) | 7.154 (0.459) | 0.267 |
| Albumin | 405 | 4.122 (0.290) | 4.174 (0.309) | 4.151 (0.301) | 0.076 |
| Total Cholesterol | 405 | 211.8 (30.1) | 212.1 (30.8) | 212.0 (30.5) | 0.888 |
| Hemoglobin | 401 | 13.99 (1.23) | 14.01 (1.24) | 14.00 (1.24) | 0.975 |
| Platelets | 398 | 246.5 (74.7) | 249.1 (57.2) | 247.9 (65.4) | 0.233 |