. 2016 Apr 16;17:35. doi: 10.1186/s10194-016-0637-6

Table 4.

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

	Correlation coefficient (r) for the nBR parameters
	Latency	Amplitude	AUC
Frequency of headache attacks (days)	0.497 (iR2)**	−0.588 (iR2)**	−0.521 (iR2)**
Frequency of headache attacks (days)	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

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