Appendix.
Comparison of T-Scores on the Digit Symbol and Symbol Search tests, and the Processing Speed Index (PSI) by site and cohort.
| Measure | Site |
Study cohort |
||||
|---|---|---|---|---|---|---|
| Arizona M (SD) | California M (SD) | pa | Cohort 1 M (SD) | Cohort 2 M (SD) | pa | |
| Digit Symbol T-scores | 48.90 (9.15) | 50.53 (10.31) | .27 | 50.80 (9.97) | 48.57 (9.90) | .13 |
| Symbol Search T-scores | 49.98 (9.35) | 49.97 (10.35) | .99 | 50.37 (9.98) | 49.23 (10.13) | .45 |
| PSI T-scores | 99.59 (13.43) | 100.15 (15.64) | .79 | 100.97 (15.09) | 98.16 (14.72) | .21 |
Note. T-Scores developed based on NP-NUMBRS data
a
Based on independent samples t-tests