Table 4.
Test-Retest Reliability Characteristics for the Entire Sample (N=88)
| Subgroup | N | % | Time 1 WRAT SS M (SD) |
Time 2 WRAT SS M (SD) |
ρ | ICC 95% CI | UER | |
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| Lower | Upper | |||||||
| Demographic Characteristics | ||||||||
| Race/Ethnicity | ||||||||
| African American | 47 | 53.4% | 80.6 (15.7) | 82.2 (16.3) | .96* | .93 | .98 | .96 |
| Hispanic | 28 | 31.8% | 81.1 (15.5) | 81.6 (16.4) | .97* | .93 | .99 | .97 |
| Non-Hispanic White | 13 | 14.8% | 101.9 (9.4) | 104.4 (10.4) | .95* | .83 | .98 | .95 |
| Years of education | ||||||||
| Some high school or less (<12 yrs) |
44 | 50.0% | 74.6 (14.9) | 76.1 (15.2) | .96* | .92 | .98 | .96 |
| High school (12 yrs) | 19 | 21.6% | 89.0 (9.8) | 89.4 (10.6) | .93* | .82 | .97 | .94 |
| Post high school (>12 yrs) | 25 | 28.4% | 96.3 (13.6) | 98.4 (15.7) | .96* | .91 | .98 | .96 |
| Test-Retest interval groups | ||||||||
| 1-3 yrs | 32 | 36.3% | 84.5 (15.1) | 84.8 (15.9) | .98* | .96 | .99 | .98 |
| 3-6 yrs | 27 | 30.7% | 85.3 (19.4) | 87.8 (20.2) | .98* | .96 | .99 | .98 |
| 6+ yrs | 29 | 33.0% | 81.9 (15.5) | 83.5 (16.5) | .95* | .89 | .98 | .95 |
| Medical Characteristics | ||||||||
| CD4 change | ||||||||
| CD4 stable | 67 | 76.1% | 80.8 (16.0) | 82.2 (16.9) | .97* | .95 | .98 | .97 |
| CD4 change | 21 | 23.9% | 93.6 (14.8) | 95.3 (15.3) | .96* | .90 | .98 | .96 |
| HIV RNA viral load | ||||||||
| Viral load stable | 58 | 65.9% | 83.7 (18.0) | 85.2 (18.9) | .98* | .96 | .99 | .98 |
| Viral load change | 30 | 34.1% | 84.1 (13.6) | 85.5 (14.3) | .95* | .90 | .98 | .96 |
| Illicit substance tox (n = 86) | ||||||||
| Tox stable | 63 | 73.3% | 84.6 (17.2) | 85.8 (18.1) | .97* | .96 | .98 | .97 |
| Tox change | 23 | 26.7% | 81.4 (15.6) | 83.4 (16.3) | .96* | .91 | .98 | .96 |
| Neurocognitive Characteristics | ||||||||
| sRCS scores | ||||||||
| Cognitively stable | 57 | 64.8% | 83.9 (16.4) | 85.5 (18.1) | .94 * | .89 | .97 | .95 |
| Cognitive improvement | 8 | 9.1% | 91.8 (14.0) | 90.5 (17.1) | .95* | .92 | .98 | .96 |
| Cognitive decline | 23 | 26.1% | 79.9 (17.5) | 81.4 (17.9) | .96* | .90 | .98 | .96 |
| Total | 88 | 100% | 83.9 (16.6) | 85.3 (17.4) | .97* | .96 | .98 | .97 |
Note. Time 1 WRAT SS M = Average WRAT-3 RR standard score at first visit; Time 2 WRAT SS M = Average WRAT-3 RR standard score at second visit; ρ = intraclass correlation; ICC 95% CI = confidence interval; UER = unbiased estimate of reliability; sRCS = standard regression-based change score.
*
p < .001.