Table 1.
Demographic comparison of participants who received MRI scans to those who were eligible, but refused participation in MRI study. Data are presented from the total sample and then stratified by ethnicity (Caucasian, African American, and Hispanic).
| Variable | Refused | Scanned | Statistic | P | |
|---|---|---|---|---|---|
|
Total Sample |
N | 407 | 769 | ||
| Age, Mean (SD) | 81.55 (6.36) | 80.433 (5.63) | t (1174) = 3.098 | 0.002 | |
| Education, Mean (SD | 10.69(4.78) | 10.48 (4.89) | t (1170) = 0.716 | 0.474 | |
| Sex (% women) | 75.4 | 67.1 | χ2 (1) = 8.79 | 0.003 | |
| Ethnicity |
χ2 (3) = 23.93 |
<0.001 |
|||
| % Caucasian | 37.3 | 26.7 | |||
| % African American |
22.6 | 34.3 | |||
| % Hispanic | 39.1 | 37.1 | |||
| %Other | 1.0 | 2.0 | |||
|
Caucasians |
N | 152 | 205 | ||
| Age, Mean (SD) | 81.49 (6.74) | 80.39 (5.85) | t (355) = 1.65 | 0.100 | |
| Education, Mean (SD | 13.97 (2.99) | 13.71 (3.22) | t (351) = 0.770 | 0.442 | |
| Sex (% women) | 68.4 | 59.5 | χ2 (1) = 2.98 | 0.084 | |
|
African Americans |
N | 92 | 264 | ||
| Age, Mean (SD) | 80.85 (6.17) | 80.22 (5.85) | t (354) = 0.871 | 0.384 | |
| Education, Mean (SD) | 11.95 (3.66) | 11.99 (3.72) | t (354) = 0.104 | 0.917 | |
| Sex (% women) | 84.8 | 68.2 | χ2 (1) = 9.42 | 0.002 | |
|
Hispanics |
N | 159 | 285 | ||
| Age, Mean (SD) | 82.07 (6.04) | 80.72 (5.30) | t (442) =2.44 | 0.015 | |
| Education, Mean (SD | 6.76 (3.86) | 6.74 (4.35) | t (442) = 0.041 | 0.967 | |
| Sex (% women) | 77.4 | 73.3 | χ2 (1) = 0.877 | 0.349 |