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. 2019 Oct 15;161(2):429–438. doi: 10.1097/j.pain.0000000000001726

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Copyright © 2019 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the International Association for the Study of Pain.

This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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Figure 4. — Correlation between percentage modification of TST after NTG administration and days of headache per month. TST, temporal summation threshold of the NWR. Dotted line represents linear regression. Panel A: correlation between percentage reduction of TST at 60 minutes after NTG administration and days of headache per month: Pearson −0.491; P = 0.001. Panel B: correlation between percentage reduction of TST at 120 minutes after NTG administration and days of headache per month: Pearson −0.332; P = 0.023. NWR, nociceptive withdrawal reflex.