Table 3. Two-way Between Groups Multiple Analysis of Variance.
| MULTIVARIATE TESTS OF SIGNIFICANT DIFFERENCES AMONG THE GROUPS ON A LINEAR COMBINATION OF PVT MEASURES | ||||||
|---|---|---|---|---|---|---|
| EFFECT | PILLAI’S TRACE | F-VALUE | HYPOTHESIS DF | ERROR DF | SIG.a | PARTIAL ETA2 |
| Impairing Medication (A) | .069 | 1.385 | 9.0 | 531.0 | .191 | .023 |
| Stimulant use (B) | .044 | 2.655 | 3.0 | 175.0 | .050 | .044b |
| A * B | .056 | 1.131 | 9.0 | 531.0 | .339 | .019 |
| TESTS OF BETWEEN SUBJECTS EFFECTS | ||||||
|---|---|---|---|---|---|---|
| MAJOR LAPSESc | MINOR LAPSESd | MEAN REACTION TIMEc | ||||
| SOURCE OF VARIATION | F | SIG. | F | SIG. | F | SIG. |
| Impairing Medication (A) | .468 | .705 | 1.822 | .145 | 2.860 | .038 |
| Amphetamine use (B) | 1.039 | .309 | 7.695 | .006e | 2.585 | .110 |
| A * B | .088 | .967 | 2.817 | .041 | 1.164 | .325 |
Notes: aα = .05.
bConsistent with a small to moderate effect-size.
cα = .008 after mitigating for violation of the assumption of equality of variance and subsequent Bonferroni adjustment.
dα = .017 after Bonferroni adjustment.
ePartial Eta Squared = .042, small to moderate effect-size.