TABLE 3.
Performance of groups on procedural learning measures
| MJ−/HIV− (n = 21) | MJ+/HIV− (n = 23) | MJ−/HIV+ (n = 25) | MJ+/HIV+ (n = 17) | ||
|---|---|---|---|---|---|
|
| |||||
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | ||
| SMT | |||||
| Trial Block 1 | 86.9 (55.0) | 107.8 (49.5) | 103.6 (57.4) | 149.6 (68.0) | |
| Trial Block 2 | 49.6 (21.1) | 61.8 (29.5) | 72.9 (46.2) | 102.4 (69.6) | |
| Trial Block 3 | 38.4 (16.0) | 41.2 (22.3) | 48.4 (28.6) | 73.5 (55.5) | |
| Trial Block 4 | 27.8 (10.2) | 35.0 (20.1) | 42.3 (26.5) | 66.7 (67.4) | |
| Overall mean performance | 50.7 (21.7) | 61.5 (24.7) | 66.8 (36.9) | 98.1 (59.6) | |
| RPT | |||||
| Trial Block 1 | 8.5 (4.3) | 7.4 (4.0) | 7.3 (3.0) | 5.2 (3.9) | |
| Trial Block 2 | 10.6 (3.9) | 8.8 (4.0) | 9.2 (4.0) | 7.9 (4.6) | |
| Trial Block 3 | 12.6 (4.3) | 11.3 (4.1) | 10.9 (3.5) | 9.0 (4.6) | |
| Trial Block 4 | 12.9 (4.0) | 11.6 (4.2) | 11.7 (3.3) | 9.7 (4.2) | |
| Overall mean performance | 11.2 (3.9) | 9.8 (3.7) | 9.8 (3.1) | 7.9 (4.1) | |
| WPTa | |||||
| Trial Block 1 | 53.7 (8.2) | 55.6 (10.3) | 52.2 (8.6) | 53.7 (9.9) | |
| Trial Block 2 | 56.3 (10.7) | 61.0 (10.1) | 58.1 (10.3) | 57.9 (9.3) | |
| Trial Block 3 | 56.2 (11.4) | 62.9 (11.1) | 61.8 (13.8) | 56.0 (15.1) | |
| Trial Block 4 | 59.6 (13.8) | 62.6 (15.4) | 61.0 (12.1) | 57.4 (11.1) | |
| Overall mean performance | 56.5 (8.8) | 60.5 (9.2) | 58.2 (8.6) | 56.2 (9.4) | |
Note. None of the data presented in this table have been transformed. MJ, marijuana; SMT, Star Mirror Tracing; RPT, Rotary Pursuit Task; WPT, Weather Prediction Task. Values for SMT are seconds to complete task (lower value is better); RPT values are seconds on target (higher value is better); WPT values are percentage of correct choices (higher value is better).
a
Sample sizes differ slightly for the WPT, as 1 person in the MJ−/HIV− group and 1 in the MJ+/HIV− group did not complete the task due to technical problems.