Table 1.
Descriptive statistics for entire sample and by amyloid β (Aβ) positivity determined from Aβ positron emission tomography. Aβ positivity was by k-means clustering (SUVR = 1.34).
| Characteristic | Entire Sample (n = 345) | Aβ Negative (n = 317) | Aβ Positive (n = 28) | p-value |
|---|---|---|---|---|
| Age, mean (SD), yr. | 64.13 (3.32) | 64.06 (3.33) | 64.88 (3.16) | 0.20 |
| Women, No. (%) | 248 (71.88) | 227 (71.61) | 21 (75.00) | 0.87 |
| Education, mean (SD), yr. | 10.55 (3.96) | 10.45 (3.97) | 11.71 (3.68) | 0.092 |
| Ethnicity, No. (%) | ||||
| Dominican | 295 (85.51) | 273 (86.12) | 22 (78.57) | 0.42 |
| Other Caribbean Hispanic | 21 (6.09) | 18 (5.68) | 3 (10.71) | |
| South American | 18 (5.22) | 16 (5.05) | 2 (7.14) | |
| Unspecified Hispanic | 7 (2.03) | 6 (1.89) | 1 (3.57) | |
| Central American | 4 (1.16) | 4 (1.26) | 0 (0) | |
| APOE-ε4, No. (%) | 123 (35.65) | 102 (32.18) | 21 (75.00) | <0.0001 |
| Cystatin C, mean (SD), mg/L | 0.97 (0.43) | 0.98 (0.44) | 0.94 (0.15) | 0.78 |
| SRT: Total Recall, mean (SD), words | 38.94 (8.82) | 39.00 (8.69) | 38.33 (10.40) | 0.75 |
| Plasma Aβ40, mean (SD), pg/mL | 222.98 (61.15) | 223.05 (61.14) | 222.18 (62.33) | 0.94 |
| Plasma Aβ42, mean (SD), pg/mL | 14.27 (3.98) | 14.39 (3.98) | 12.91 (3.77) | 0.057 |
| Aβ42/Aβ40 ratio, mean (SD) | 0.065 (0.013) | 0.065 (0.013) | 0.058 (0.009) | 0.0005 |