Table 3. Test-Retest Reliability Coefficients and Reliable Change Index Scores Based on Standard Errors of Measurement for CERAD NC Sample.
Time Interval | Test-Retest Reliability | SEm | SEdiff | RC (90%) CI |
---|---|---|---|---|
Baseline to Visit 1 | .80 | 4.53 | 6.41 | ± 10.51 |
Baseline to Visit 2 | .65 | 6.67 | 9.43 | ± 15.47 |
Baseline to Visit 3 | .76 | 5.12 | 7.24 | ± 11.87 |
Baseline to Visit 4 | .69 | 6.12 | 8.66 | ± 14.20 |
Baseline to Last Visit | .74 | 5.52 | 7.80 | ± 12.80 |
Note. Test-retest reliability coefficients based on the correlation between the mean CERAD Total Score at baseline, (M = 79.8, SD = 9.4), and each subsequent visit.
CERAD = Consortium to Establish a Registry for Alzheimer's Disease; NC = normal control; SEm = standard error of measurement; SEdiff = standard error of difference; RC = reliable change; CI = confidence interval.