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Table 4 Multivariate linear regression analysis of the relationship between trait anxiety and motor cortex excitability before QST evoked pain (n = 47)

From: Association of anxiety with intracortical inhibition and descending pain modulation in chronic myofascial pain syndrome

Dependent variable Type III sum of squares df Mean square error F P Partial eta squared
Motor threshold 256.75 4 64.19 1.12 0.36 0.10
Motor evoked potential 1.93 4 0.48 0.87 0.48 0.08
Intracortical facilitation 6.25 4 1.56 5.69 0.001* 0.37
Short intracortical inhibition 0.228 4 0.057 3.61 0.01* 0.28
Cortical silent period 5466.5 4 1366 5.67 0.001* 0.37
  β SEM t   P Partial eta squared
Motor threshold       
Trait-anxiety −0.06 0.17 −0.38   0.70 0.004
Age (years) 0.17 0.09 1.84   0.07 0.08
B-PCP:S 0.09 0.07 1.36   0.18 0.04
Motor evoked potential       
Trait-anxiety −0.02 0.02 −0.78   0.44 0.02
Age (years) −0.01 0.009 −1.37   0.17 0.04
B-PCP:S −0.007 0.007 −1.05   0.29 0.03
Intracortical Facilitation c       
Trait-anxiety 0.05 0.012 4.06   0.00* 0.29
Age (years) −0.008 0.007 −1.19   0.23 0.03
B-PCP:S −0.004 0.005 −0.77   0.45 0.01
Short intracortical inhibition c       
Trait-anxiety 0.001 0.003 0.32   0.75 0.003
Age (years) 0.00 0.002 0.21   0.83 0.001
B-PCP:S −0.002 0.001 −1.21   0.23 0.04
Cortical silent period       
Trait-anxiety −1.17 0.39 −2.99   0.01* 0.18
Age (years) -.013 0.22 −0.06   0.95 0.00
B-PCP:S −0.163 0.16 −1.02   0.31 0.03
Dependent variable Type III sum of squares df Mean square error F P Partial eta squared
Motor evoked potential 10.48 3 3.49 4.93 0.13 0.12
Intracortical facilitation 4.27 3 1.42 5.08 0.004* 0.27
Short intracortical inhibition 0.04 3 0.012 0.31 0.81 0.02
Cortical silent period 2979.0 3 993.01 2.62 0.06 0.16
  β SEM t   P Partial Eta Squared
Motor evoked potential       
Trait-anxiety −0.04 0.02 −2.01   0.05 0.09
Age (years) −0.006 0.01 −0.53   0.59 0.01
B-PCP:S −0.04 0.08 −0.28   0.78 0.01
Intracortical facilitation c       
Trait-anxiety 0.04 0.01 3.09   0.01* 0.19
Age (years) 0.002 0.007 0.32   0.75 0.01
B-PCP:S 0.02 0.005 3.16   0.01* 0.19
Short intracortical inhibition c       
Trait-anxiety 0.003 0.005 0.57   0.57 0.008
Age (years) 0.00 0.003 −0.07   0.95 0.001
B-PCP:S −0.002 0.002 −0.88   0.38 0.01
Cortical silent period       
Trait-anxiety −1.23 0.45 −2.72   0.01* 0.15
Age (years) −0.08 0.26 −0.31   0.75 0.002
B-PCP:S 0.05 0.18 0.25   0.80 0.001
  1. bProfile of Chronic Pain: Screen for a Brazilian population (B-PCP:S);c(ratio: ICF/test stimulus; ratio: SICI/test stimulus). *P < 0.05