Table 2.
Mean scores and group comparison on five cognitive variables
| MA (n = 18) |
noMA (n = 18) |
noSUD (n = 18) |
Group differences | |||
|---|---|---|---|---|---|---|
| Test statistic (df) | p-value | Effect size | ||||
| Trial 1 | 6.1 (2.5) | 6.8 (2.0) | 7.7 (2.1) | H [2] = 2.7 | .259 | ηp2 = .014 |
| Trial 5 | 10.8 (2.8) | 12.5 (2.2) | 13.6 (1.6) | H [2] = 11.7 | .003** | ηp2 = .190++ |
| Cued recall | 12.0 (3.3) | 12.6 (2.9) | 13.5 (1.5) | H [2] = 0.9 | .623 | ηp2 = .022 |
| Go/noGo | 468.1 (65.6) | 452.4 (56.2) | 451.8 (60.2) | H [2] = 3.3 | .188 | ηp2 = .025 |
| Alertness | 273.0 (50.7) | 249.3 (34.8) | 256.5 (21.1) | H [2] = 1.4 | .493 | ηp2 = .011 |
Notes: ** p < 0.01; ++ large effect as indicated by ηp2 > 0.13 [25]. Trial 1, number of words recalled on trial 1 of the VLMT; trial 5, number of words recalled on trial 5 of the VLMT; cued recall, number of words of the VLMT correctly recognized after a delay, corrected for recognition mistakes; go/noGo, inverse efficiency score of the “go/noGo” subtest of the TAP; alertness, mean reaction time of the “alertness” subtest of the TAP in milliseconds; VLMT, Verbal Learning Memory Test; TAP, Test of Attentional Performance