Table 3.
Test performance of subjects who participated at two assessment times
| Domains/tests | Time 1 Control M (SD) | MA M (SD) | Time 2 Control M (SD) | MA M (SD) |
| Attention/processing speed | ||||
| Trails Aa | 29.8 (11.5) | 31.2 (18.5) | 27.9 (10.2) | 23.5 (4.3) |
| Stroop–words | 101.6 (19.3) | 100.2 (15.5) | 105.2 (21.3) | 104.8 (15.0) |
| Stroop–colors | 73.0 (11.8) | 67.1 (9.9) | 75.9 (12.0) | 72.4 (9.1) |
| Working memory | ||||
| Backward digit span | 4.43 (1.33) | 4.22 (1.06) | 5.05 (1.83) | 4.06 (1.16) |
| Sentence span | 2.57 (0.60) | 2.44 (1.04) | 2.90 (0.70) | 2.71 (0.92) |
| Missing digit span | 6.14 (1.77) | 6.61 (1.94) | 6.24 (1.76) | 6.67 (1.61) |
| Learning/memory | ||||
| Selective Reminding Test | ||||
| Total | 120.9 (12.1) | 108.2 (13.2) | 117.1 (15.9) | 113.1 (18.6) |
| Intrusionsa | 1.89 (2.64) | 3.18 (3.52) | 2.29 (2.83) | 2.88 (2.78) |
| Repeated Memory Test | ||||
| Word recall | 3.57 (2.18) | 2.83 (2.79) | 4.14 (2.87) | 2.11 (1.88) |
| Picture recall | 8.05 (2.54) | 6.00 (2.77) | 7.29 (2.67) | 5.17 (2.53) |
| Word recognition | 14.33 (5.07) | 11.94 (4.35) | 14.67 (5.09) | 10.72 (4.91) |
| Picture recognition | 19.67 (3.95) | 17.56 (3.57) | 20.24 (2.88) | 17.61 (4.26) |
| Timed executive functioning | ||||
| Trails Ba | 69.5 (32.1) | 72.9 (30.9) | 69.0 (30.5) | 69.5 (22.8) |
| Stroop–color/word | 43.5 (7.6) | 38.3 (7.8) | 46.4 (10.5) | 41.1 (7.5) |
| Untimed executive functioning | ||||
| Discrimination learning | 22.0 (7.0) | 19.5 (6.1) | 24.8 (6.3) | 21.5 (5.4) |
| Logical problems | 6.3 (1.8) | 5.5 (1.9) | 7.1 (1.1) | 7.4 (1.5) |
Notes: Values are means (SDs), based on data from 19–21 participants in the control group and 19–17 participants in the methamphetamine (MA)-dependent group. The groups are subsets of larger samples that participated in Test 1.
a
Higher scores indicate worse performance.