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Table 4 Correlation coefficients between headache characteristics and parameters of the nBR and the PREP in migraineurs

From: Differences in central facilitation between episodic and chronic migraineurs in nociceptive-specific trigeminal pathways

 

Correlation coefficient (r) for the nBR parameters

Latency

Amplitude

AUC

Frequency of headache attacks (days)

0.497 (iR2)**

−0.588 (iR2)**

−0.521 (iR2)**

0.469 (cR2)**

−0.634 (cR2)**

−0.626 (cR2)**

Duration of headache attacks (hours)

NS

NS

NS

Pain intensity of headache attacks (NRS)

NS

NS

NS

  1. Spearman’s correlation test (r), **p < 0.01. EM episodic migraine, CM chronic migraine, PREP pain-related evoked potential, NRS numeric rating scale, NS non-significant, nBR nociceptive blink reflex, iR2 ipsilateral R2 component, cR2 contralateral R2 component, AUC area under the curve, PREP pain-related evoked potential, PPA peak-to-peak amplitude