Table 1.
Linear regression of the relationship between cortical excitability parameters and potential confounding factors (n = 47)
| Parameter | SEM | β a | t | P |
|---|---|---|---|---|
|
Motor Threshold |
|
|
|
|
| Age (years) |
0.09 |
0.31 |
2.15 |
0.03 |
|
Short Intracortical inhibition (ratio: SICI/test stimulus) |
|
|
|
|
| Brazilian Portuguese Catastrophizing Scale (B-PCS) |
−0.005 |
−0.44 |
−3.24 |
0.002 |
|
Intracortical facilitation |
|
|
|
|
| (ratio: ICF/test stimulus) |
|
|
|
|
| Trait-anxiety |
0.011 |
0.56 |
4.48 |
0.001 |
|
Cortical silent period |
|
|
|
|
| Trait-anxiety | 0.39 | −0.41 | −2.95 | 0.005 |
a Value adjusted by multiple regression analysis with a stepwise forward method controlling for collinearity. The covariates included in each model were: state-trait anxiety, pain-related catastrophic thinking, depressive symptoms and age.