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. 2021 Feb 8;162(9):2376–2385. doi: 10.1097/j.pain.0000000000002223

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Copyright © 2021 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 7. — Changes in RTh and TST after NTG administration in MIG+ and MIG− subjects. T30, T60, and T120: evaluations at 30, 60, and 120 minutes after NTG administration (0.9 mg sublingual). MIG+: subjects with episodic migraine and a positive migraine-induction test (n = 16). MIG−: subjects with episodic migraine and a negative migraine-induction test (n = 8); Statistical analysis: 2-factor ANOVA for repeated measures (factor “HEADACHE” with 2 levels: MIG+ vs MIG−; factor “TIME” with 4 levels: Baseline, T30, T60, T120): RTh (A): TIME: P = 0.128; HEADACHE: P = 0.568; TIME × HEADACHE: P = 0.528. TST (B): TIME: P = 0.001; HEADACHE: P = 0.549; TIME × HEADACHE: P = 0.858. ANOVA, analysis of variance; NTG, nitroglycerin; RTh, reflex threshold; TST, temporal summation threshold.