Table 3.
Behavioral dispositions and short term memory performance of participants.
| Variables | Ketamine (n = 159) | Poly Drugs (n = 26) | Cigarette (n = 49) | Total (n = 234) | F/χ2 | p |
|---|---|---|---|---|---|---|
| Mean (SD) or n (%) | Mean (SD) or n (%) | Mean (SD) or n (%) | Mean (SD) or n (%) | |||
| Behavioral disposition | ||||||
| Impulsivity (BIS)a | 68.89 (9.22) | 74.00 (9.14) | 64.67 (8.55) | 68.57 (9.39) | 9.27* | .000 |
| Aggression (BPAQ) | 69.93 (17.97) | 64.38 (14.76) | 71.31 (17.49) | 69.60 (17.58) | 1.41 | .247 |
| Sensitivity to reward | 12.18 (5.95) | 10.54 (6.22) | 12.31 (4.78) | 12.03 (5.76) | 0.99 | .848 |
| Sensitivity to punishment | 10.61 (5.54) | 10.35 (5.18) | 10.12 (4.89) | 10.48 (5.36) | 0.17 | .375 |
| Neuropsychological assessment | ||||||
| N-back memory | ||||||
| Accuracyb | 5.78 | .004* | ||||
| 0-back | 0.938 (0.142) | 0.962 (0.062) | 0.954 (0.075) | 0.944 (0.124) | ||
| 1-back | 0.768 (0.193) | 0.739 (0.141) | 0.869 (0.186) | 0.786 (0.191) | ||
| 2-back | 0.626 (0.229) | 0.588 (0.253) | 0.745 (0.174) | 0.647 (0.227) | ||
| Reaction time | .030 | .971 | ||||
| 0-back | 448.188 (65.204) | 450.411 (65.205) | 459.412 (71.812) | 450.785 ( 80.198) | ||
| 1-back | 492.535 (102.897) | 596.404 (104.423) | 480.332 (98.658) | 491.521 (102.013) | ||
| 2-back | 582.334 (145.799) | 562.321 (139.662) | 572.398 (122.804) | 578.030 (140.219) | ||
Bonferroni correction was used to adjust multiple comparisons. Tukey’s method was performed to test the post-hoc difference.
*p < .05/10 = .005.
aPolydrugs > Ketamine > Cigarette.
bCigarette > Polydrugs, Ketamine.