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. 2020 Mar 18;40(9):913–923. doi: 10.1177/0333102420912725

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© International Headache Society 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Test-retest reliability of chirp responses (based on 7-channel EEG, electrode Oz) in control and migraine groups is moderate to good at driving and harmonic frequencies. (a) Overall response power in the three bands of interest (red circles: 10–18 Hz; blue crosses: 19–26 Hz; black squares: 27–40 Hz) for measurement 1 and measurement 2 (1 to 42 days after measurement 1). Intraclass correlation coefficients (ICC) are between 0.10 and 0.51, indicating low to moderate reproducibility for the overall power. Dashed line indicates a perfect reproducibility between measurements. (b) Idem for the response at driving frequencies (10–40 Hz), with ICC between 0.68 and 0.77, indicating good reproducibility. (c) Idem for the response at harmonic frequencies (20–80 Hz), with ICC between 0.41 and 0.62, indicating moderate reproducibility.