Table 5.
Correlation (r) and p values between partial component scores for the Barratt’s Impulsivity Scale (BIS) and Impulsive Sensation Seeking (ImpSS) scale.
| ImpSS Comp 1 | ImpSS Comp 2 | ImpSS Comp 3 | |
|---|---|---|---|
| BIS Comp 1 | r = 0.612, pperm<0.0005 | r = 0.279, pperm<0.0005 | r = −0.373, pperm<0.0005 |
| BIS Comp 2 | r = −0.355, pperm<0.0005 | r = −0.030, pperm = 0.594 | r = 0.261, pperm<0.0005 |
| BIS Comp 3 | r = −0.018, pperm = 0.747 | r = −0.039, pperm = 0.508 | r = 0.137, pperm = 0.017 |
We provide permutation (pperm) p values; they are nearly identical to parametric p values. To note, Partial Component 1 of the BIS is significantly related to all Partial Components for the ImpSS. This suggests that the ImpSS is a largely unidimensional scale in respect to our population (see also Figures 4a and b). Importantly, the Partial Component 2 for BIS and ImpSS have nearly null correlation. This suggests that these instruments capture orthogonal factors of impulsivity (see also Figures 2a and b, 4a and c).